< < PT08 : PT09 : PT10 > >

PT09: Transit Signal Priority

The Transit Signal Priority service package allows a transit vehicle to request priority at one or a series of intersections. The request can be made via short range communications from the transit vehicle or using track circuits or other rail infrastructure for light rail transit implementations. The service package provides feedback to the transit vehicle operator indicating whether the signal priority has been granted or not. It supports transit-specific signal indicators that can be used to exclusively give right-of-way to transit vehicles, not other road users at the intersection. This service package can contribute to improved operating performance of the transit vehicles by reducing the time spent stopped at a red light.

Relevant Regions: Australia, Canada, European Union, and United States

Enterprise

Development Stage Roles and Relationships

Installation Stage Roles and Relationships

Operations and Maintenance Stage Roles and Relationships
(hide)

Source Destination Role/Relationship
Connected Vehicle Roadside Equipment Maintainer Connected Vehicle Roadside Equipment Maintains
Connected Vehicle Roadside Equipment Manager Connected Vehicle Roadside Equipment Manages
Connected Vehicle Roadside Equipment Owner Connected Vehicle Roadside Equipment Maintainer System Maintenance Agreement
Connected Vehicle Roadside Equipment Owner Connected Vehicle Roadside Equipment Manager Operations Agreement
Connected Vehicle Roadside Equipment Owner ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Connected Vehicle Roadside Equipment Owner ITS Roadway Equipment Owner Information Exchange and Action Agreement
Connected Vehicle Roadside Equipment Owner ITS Roadway Equipment User Service Usage Agreement
Connected Vehicle Roadside Equipment Owner Traffic Management Center Maintainer Maintenance Data Exchange Agreement
Connected Vehicle Roadside Equipment Owner Traffic Management Center Owner Information Exchange and Action Agreement
Connected Vehicle Roadside Equipment Owner Traffic Management Center User Service Usage Agreement
Connected Vehicle Roadside Equipment Owner Transit Vehicle OBE Maintainer Maintenance Data Exchange Agreement
Connected Vehicle Roadside Equipment Owner Transit Vehicle OBE Owner Information Exchange and Action Agreement
Connected Vehicle Roadside Equipment Owner Transit Vehicle OBE User Service Usage Agreement
Connected Vehicle Roadside Equipment Owner Transit Vehicle Operator Application Usage Agreement
Connected Vehicle Roadside Equipment Supplier Connected Vehicle Roadside Equipment Owner Warranty
ITS Roadway Equipment Maintainer ITS Roadway Equipment Maintains
ITS Roadway Equipment Manager ITS Roadway Equipment Manages
ITS Roadway Equipment Owner Connected Vehicle Roadside Equipment Maintainer Maintenance Data Exchange Agreement
ITS Roadway Equipment Owner Connected Vehicle Roadside Equipment Owner Information Exchange and Action Agreement
ITS Roadway Equipment Owner Connected Vehicle Roadside Equipment User Service Usage Agreement
ITS Roadway Equipment Owner ITS Roadway Equipment Maintainer System Maintenance Agreement
ITS Roadway Equipment Owner ITS Roadway Equipment Manager Operations Agreement
ITS Roadway Equipment Owner Other ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
ITS Roadway Equipment Owner Other ITS Roadway Equipment Owner Information Exchange and Action Agreement
ITS Roadway Equipment Owner Other ITS Roadway Equipment User Service Usage Agreement
ITS Roadway Equipment Owner Traffic Management Center Maintainer Maintenance Data Exchange Agreement
ITS Roadway Equipment Owner Traffic Management Center Owner Information Exchange and Action Agreement
ITS Roadway Equipment Owner Traffic Management Center User Service Usage Agreement
ITS Roadway Equipment Supplier ITS Roadway Equipment Owner Warranty
Other ITS Roadway Equipment Maintainer Other ITS Roadway Equipment Maintains
Other ITS Roadway Equipment Manager Other ITS Roadway Equipment Manages
Other ITS Roadway Equipment Owner ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Other ITS Roadway Equipment Owner ITS Roadway Equipment Owner Information Exchange and Action Agreement
Other ITS Roadway Equipment Owner ITS Roadway Equipment User Service Usage Agreement
Other ITS Roadway Equipment Owner Other ITS Roadway Equipment Maintainer System Maintenance Agreement
Other ITS Roadway Equipment Owner Other ITS Roadway Equipment Manager Operations Agreement
Other ITS Roadway Equipment Supplier Other ITS Roadway Equipment Owner Warranty
Traffic Management Center Maintainer Traffic Management Center Maintains
Traffic Management Center Manager Traffic Management Center Manages
Traffic Management Center Owner Connected Vehicle Roadside Equipment Maintainer Maintenance Data Exchange Agreement
Traffic Management Center Owner Connected Vehicle Roadside Equipment Owner Information Provision Agreement
Traffic Management Center Owner Connected Vehicle Roadside Equipment User Service Usage Agreement
Traffic Management Center Owner ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Traffic Management Center Owner ITS Roadway Equipment Owner Information Provision Agreement
Traffic Management Center Owner ITS Roadway Equipment User Service Usage Agreement
Traffic Management Center Owner Traffic Management Center Maintainer System Maintenance Agreement
Traffic Management Center Owner Traffic Management Center Manager Operations Agreement
Traffic Management Center Owner Transit Management Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center Owner Transit Management Center Owner Information Exchange Agreement
Traffic Management Center Owner Transit Management Center User Service Usage Agreement
Traffic Management Center Owner Transit Operations Personnel Application Usage Agreement
Traffic Management Center Owner Transportation Information Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center Owner Transportation Information Center Owner Information Provision Agreement
Traffic Management Center Owner Transportation Information Center User Service Usage Agreement
Traffic Management Center Supplier Traffic Management Center Owner Warranty
Transit Management Center Maintainer Transit Management Center Maintains
Transit Management Center Manager Transit Management Center Manages
Transit Management Center Manager Transit Operations Personnel System Usage Agreement
Transit Management Center Owner Traffic Management Center Maintainer Maintenance Data Exchange Agreement
Transit Management Center Owner Traffic Management Center Owner Information Exchange Agreement
Transit Management Center Owner Traffic Management Center User Service Usage Agreement
Transit Management Center Owner Transit Management Center Maintainer System Maintenance Agreement
Transit Management Center Owner Transit Management Center Manager Operations Agreement
Transit Management Center Owner Transit Vehicle OBE Maintainer Maintenance Data Exchange Agreement
Transit Management Center Owner Transit Vehicle OBE Owner Information Provision Agreement
Transit Management Center Owner Transit Vehicle OBE User Service Usage Agreement
Transit Management Center Owner Transit Vehicle Operator Application Usage Agreement
Transit Management Center Supplier Transit Management Center Owner Warranty
Transit Operations Personnel Transit Management Center Operates
Transit Vehicle OBE Maintainer Transit Vehicle OBE Maintains
Transit Vehicle OBE Manager Transit Vehicle OBE Manages
Transit Vehicle OBE Manager Transit Vehicle Operator System Usage Agreement
Transit Vehicle OBE Owner Connected Vehicle Roadside Equipment Maintainer Maintenance Data Exchange Agreement
Transit Vehicle OBE Owner Connected Vehicle Roadside Equipment Owner Expectation of Data Provision
Transit Vehicle OBE Owner Connected Vehicle Roadside Equipment User Service Usage Agreement
Transit Vehicle OBE Owner ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Transit Vehicle OBE Owner ITS Roadway Equipment Owner Expectation of Data Provision
Transit Vehicle OBE Owner ITS Roadway Equipment User Service Usage Agreement
Transit Vehicle OBE Owner Transit Management Center Maintainer Maintenance Data Exchange Agreement
Transit Vehicle OBE Owner Transit Management Center Owner Expectation of Data Provision
Transit Vehicle OBE Owner Transit Management Center User Service Usage Agreement
Transit Vehicle OBE Owner Transit Operations Personnel Application Usage Agreement
Transit Vehicle OBE Owner Transit Operations Personnel Vehicle Operating Agreement
Transit Vehicle OBE Owner Transit Vehicle OBE Maintainer System Maintenance Agreement
Transit Vehicle OBE Owner Transit Vehicle OBE Manager Operations Agreement
Transit Vehicle OBE Supplier Transit Vehicle OBE Owner Warranty
Transit Vehicle Operator Transit Vehicle OBE Operates
Transportation Information Center Maintainer Transportation Information Center Maintains
Transportation Information Center Manager Transportation Information Center Manages
Transportation Information Center Owner Transit Vehicle OBE Maintainer Maintenance Data Exchange Agreement
Transportation Information Center Owner Transit Vehicle OBE Owner Information Provision Agreement
Transportation Information Center Owner Transit Vehicle OBE User Service Usage Agreement
Transportation Information Center Owner Transit Vehicle Operator Application Usage Agreement
Transportation Information Center Owner Transportation Information Center Maintainer System Maintenance Agreement
Transportation Information Center Owner Transportation Information Center Manager Operations Agreement
Transportation Information Center Supplier Transportation Information Center Owner Warranty
Wayside Equipment Maintainer Wayside Equipment Maintains
Wayside Equipment Manager Wayside Equipment Manages
Wayside Equipment Owner Connected Vehicle Roadside Equipment Maintainer Maintenance Data Exchange Agreement
Wayside Equipment Owner Connected Vehicle Roadside Equipment Owner Information Exchange and Action Agreement
Wayside Equipment Owner Connected Vehicle Roadside Equipment User Service Usage Agreement
Wayside Equipment Owner ITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Wayside Equipment Owner ITS Roadway Equipment Owner Information Exchange and Action Agreement
Wayside Equipment Owner ITS Roadway Equipment User Service Usage Agreement
Wayside Equipment Owner Wayside Equipment Maintainer System Maintenance Agreement
Wayside Equipment Owner Wayside Equipment Manager Operations Agreement
Wayside Equipment Supplier Wayside Equipment Owner Warranty

Functional

This service package includes the following Functional View PSpecs:

Physical Object Functional Object PSpec Number PSpec Name
Connected Vehicle Roadside Equipment RSE Intersection Management 1.1.1.6 Collect Vehicle Roadside Safety Data
1.1.2.6 Process Collected Vehicle Safety Data
1.1.6 Collect Vehicle Traffic Surveillance Data
1.2.7.14 Manage Connected Signal Priority and Preemption Requests
1.2.7.15 Process Intersection Safety Data
1.2.7.4 Process In-vehicle Signage Data
1.2.7.7 Process Vehicle Safety and Environmental Data for Output
1.5.10 Collect Vehicle Emissions Messages
ITS Roadway Equipment Roadway Signal Control 1.1.1.1 Process Traffic Sensor Data
1.2.7.1 Process Indicator Output Data for Roads
1.2.7.13 Provide Device Interface for Field Management Stations
1.2.7.16 Process Signal Control Conflict Monitoring
1.2.7.2 Monitor Roadside Equipment Operation
1.2.7.8 Provide Device Interface to Other Roadway Devices
Roadway Transit Signal Control 1.1.1.1 Process Traffic Sensor Data
1.2.7.1 Process Indicator Output Data for Roads
1.6.1.1 Detect Roadway Events
1.6.1.2.1 Control HRI Traffic Signals
1.6.1.2.2 Control HRI Warnings and Barriers
1.6.1.2.3 Provide SSR Device Controls
1.6.1.2.5 Manage Device Control
1.6.1.2.6 Maintain Device State
1.6.3.1 Interact with Wayside Systems
Traffic Management Center TMC Multi-Modal Coordination 1.1.2.2 Process Traffic Data
1.2.2.1 Determine Indicator State for Freeway Management
1.2.2.2 Determine Indicator State for Road Management
1.2.3 Determine Ramp State
1.3.2.2 Review and Classify Possible Incidents
1.4.2 Collect Demand Forecast Data
TMC Signal Control 1.1.2.2 Process Traffic Data
1.1.2.5 Process Vehicle Situation Data
1.1.4.1 Retrieve Traffic Data
1.1.4.4 Manage Traffic Archive Data
1.1.5 Exchange Data with Other Traffic Centers
1.2.1 Select Strategy
1.2.2.2 Determine Indicator State for Road Management
1.2.4.1 Output Control Data for Roads
1.2.6.1 Maintain Traffic and Sensor Static Data
1.2.8 Collect Traffic Field Equipment Fault Data
Transit Management Center Transit Center Priority Management 4.1.4 Collect and Process Transit Vehicle Data
4.1.5.1 Manage Transit Vehicle Operations
4.2.1.6 Produce Transit Service Data for Manage Transit Use
4.2.4 Generate Transit Vehicle Schedule Assignments
Transit Vehicle OBE Transit Vehicle Signal Priority 4.1.1 Process On-Board Systems Data
4.1.2 Determine Transit Vehicle Service Status
4.1.3 Provide Transit Vehicle Location Data
Transportation Information Center TIC Traffic Control Dissemination 6.2.2 Collect Traffic Data
6.5.1 Provide Broadcast Data Interface
Vehicle Vehicle Basic Safety Communication 3.1.1 Produce Collision and Crash Avoidance Data
3.1.3 Process Vehicle On-board Data
3.1.4 Communicate with Remote Vehicles
3.1.6 Provide Vehicle Acceleration and Deceleration Inputs
3.2.3.2 Manage Platoon Following
3.2.3.3 Process Data for Vehicle Actuators
3.2.3.5.1 Process General Vehicle Sensor Data
3.2.4 Process Sensor Data for Automatic Vehicle Operations
6.7.1.3 Process Vehicle Location Data
6.7.1.4 Update Vehicle Navigable Map Database
6.7.3.2 Provide Driver Information Interface
Vehicle Intersection Warning 3.1.1 Produce Collision and Crash Avoidance Data
3.1.2 Carry-out Safety Analysis
3.1.3 Process Vehicle On-board Data
3.1.4 Communicate with Remote Vehicles
3.1.6 Provide Vehicle Acceleration and Deceleration Inputs
3.2.1 Provide Driver Interface
3.2.3.1 Provide Command Interface
3.2.3.3 Process Data for Vehicle Actuators
3.2.3.5.1 Process General Vehicle Sensor Data
3.2.4 Process Sensor Data for Automatic Vehicle Operations
3.3.2 Build Automatic Collision Notification Message
6.7.1.3 Process Vehicle Location Data
6.7.1.4 Update Vehicle Navigable Map Database
6.7.3.1 Provide Driver with Personal Travel Information
6.7.3.2 Provide Driver Information Interface

Physical

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Includes Physical Objects:

Physical Object Class Description
Connected Vehicle Roadside Equipment Field 'Connected Vehicle Roadside Equipment' (CV RSE) represents the Connected Vehicle roadside devices (i.e., Roadside Units (RSUs)) equipped with short range wireless (SRW) communications technology, as well as any other supporting equipment that leverage the RSU and are not described by other objects (e.g., a local roadside processor). CVRSE are used to send messages to, and receive messages from, nearby vehicles and personal devices equipped with compatible communications technology. Communications with adjacent field equipment and back office centers that monitor and control the RSE are also supported. This device operates from a fixed position and may be permanently deployed or a portable device that is located temporarily in the vicinity of a traffic incident, road construction, or a special event. It includes a processor, data storage, and communications capabilities that support secure communications with passing vehicles, other field equipment, and centers.
ITS Roadway Equipment Field 'ITS Roadway Equipment' represents the ITS equipment that is distributed on and along the roadway that monitors and controls traffic and monitors and manages the roadway. This physical object includes traffic detectors, environmental sensors, traffic signals, highway advisory radios, dynamic message signs, CCTV cameras and video image processing systems, grade crossing warning systems, and ramp metering systems. Lane management systems and barrier systems that control access to transportation infrastructure such as roadways, bridges and tunnels are also included. This object also provides environmental monitoring including sensors that measure road conditions, surface weather, and vehicle emissions. Work zone systems including work zone surveillance, traffic control, driver warning, and work crew safety systems are also included.
Other ITS Roadway Equipment Field Representing another set of ITS Roadway Equipment, 'Other ITS Roadway Equipment' supports 'field device' to 'field device' communication and coordination, and provides a source and destination for information that may be exchanged between ITS Roadway Equipment. The interface enables direct coordination between field equipment. Examples include the direct interface between sensors and other roadway devices (e.g., Dynamic Message Signs) and the direct interface between roadway devices (e.g., between a Signal System Master and Signal System Local equipment) or a connection between an arterial signal system master and a ramp meter controller.
Traffic Management Center Center The 'Traffic Management Center' monitors and controls traffic and the road network. It represents centers that manage a broad range of transportation facilities including freeway systems, rural and suburban highway systems, and urban and suburban traffic control systems. It communicates with ITS Roadway Equipment and Connected Vehicle Roadside Equipment (RSE) to monitor and manage traffic flow and monitor the condition of the roadway, surrounding environmental conditions, and field equipment status. It manages traffic and transportation resources to support allied agencies in responding to, and recovering from, incidents ranging from minor traffic incidents through major disasters.
Transit Management Center Center The 'Transit Management Center' manages transit vehicle fleets and coordinates with other modes and transportation services. It provides operations, maintenance, customer information, planning and management functions for the transit property. It spans distinct central dispatch and garage management systems and supports the spectrum of fixed route, flexible route, paratransit services, transit rail, and bus rapid transit (BRT) service. The physical object's interfaces support communication between transit departments and with other operating entities such as emergency response services and traffic management systems.
Transit Operations Personnel Center 'Transit Operations Personnel' represents the people that are responsible for fleet management, maintenance operations, and scheduling activities of the transit system. These different roles represent a variety of individuals in the transit industry. Within the transit industry the person responsible for fleet management is known by many names: Street Supervisor, Starter, Dispatcher, Supervisor, Traffic Controller, Transportation Coordinator. This person actively monitors, controls, and modifies the transit fleet routes and schedules on a day to day basis (dynamic scheduling). The modifications will take account of abnormal situations such as vehicle breakdown, vehicle delay, detours around work zones or incidents (detour management, connection protection, and service restoration), and other causes of route or schedule deviations. Transit operations personnel are also responsible for demand responsive transit operation and for managing emergency situations within the transit network such as silent alarms on board transit vehicles, or the remote disabling of the vehicle. In addition the Transit Operations Personnel may be responsible for assigning vehicle operators to routes, checking vehicle operators in and out, and managing transit stop issues. This object also represents the personnel in the transit garage that are responsible for maintenance of the transit fleets, including monitoring vehicle status, matching vehicles with operators, and maintenance checking of transit vehicles. Finally, it represents the people responsible for planning, development, and management of transit routes and schedules.
Transit Vehicle OBE Vehicle The 'Transit Vehicle On-Board Equipment' (OBE) resides in a transit vehicle and provides the sensory, processing, storage, and communications functions necessary to support safe and efficient movement of passengers. The types of transit vehicles containing this physical object include buses, paratransit vehicles, light rail vehicles, other vehicles designed to carry passengers, and supervisory vehicles. It collects ridership levels and supports electronic fare collection. It supports a traffic signal prioritization function that communicates with the roadside physical object to improve on-schedule performance. Automated vehicle location enhances the information available to the transit operator enabling more efficient operations. On-board sensors support transit vehicle maintenance. The physical object supports on-board security and safety monitoring. This monitoring includes transit user or vehicle operator activated alarms (silent or audible), as well as surveillance and sensor equipment. The surveillance equipment includes video (e.g. CCTV cameras), audio systems and/or event recorder systems. It also furnishes travelers with real-time travel information, continuously updated schedules, transfer options, routes, and fares. A separate 'Vehicle OBE' physical object supports the general vehicle safety and driver information capabilities that apply to all vehicles, including transit vehicles. The Transit Vehicle OBE supplements these general capabilities with capabilities that are specific to transit vehicles.
Transit Vehicle Operator Vehicle The 'Transit Vehicle Operator' represents the person that receives and provides additional information that is specific to operating the ITS functions in all types of transit vehicles. The information received by the operator would include status of on-board systems. Additional information received depends upon the type of transit vehicle. In the case of fixed route transit vehicles, the Transit Vehicle Operator would receive operator instructions that might include actions to take to correct schedule deviations. In the case of flexible fixed routes and demand response routes the information would also include dynamic routing or passenger pickup information.
Transportation Information Center Center The 'Transportation Information Center' collects, processes, stores, and disseminates transportation information to system operators and the traveling public. The physical object can play several different roles in an integrated ITS. In one role, the TIC provides a data collection, fusing, and repackaging function, collecting information from transportation system operators and redistributing this information to other system operators in the region and other TICs. In this information redistribution role, the TIC provides a bridge between the various transportation systems that produce the information and the other TICs and their subscribers that use the information. The second role of a TIC is focused on delivery of traveler information to subscribers and the public at large. Information provided includes basic advisories, traffic and road conditions, transit schedule information, yellow pages information, ride matching information, and parking information. The TIC is commonly implemented as a website or a web-based application service, but it represents any traveler information distribution service.
Wayside Equipment Field 'Wayside Equipment' represents train interface equipment (usually) maintained and operated by the railroad and (usually) physically located at or near a grade crossing. It is a source and destination for information for, or about, approaching trains and their crews (e.g. the time at which the train will arrive and the time it will take to clear a crossing, crossing status or warnings, etc.). Generally one wayside equipment interface would be associated with one highway rail intersection. However, multiple crossings may be controlled using information based on data from one wayside equipment interface.

Includes Functional Objects:

Functional Object Description Physical Object
Roadway Signal Control 'Roadway Signal Control' includes the field elements that monitor and control signalized intersections. It includes the traffic signal controllers, detectors, conflict monitors, signal heads, and other ancillary equipment that supports traffic signal control. It also includes field masters, and equipment that supports communications with a central monitoring and/or control system, as applicable. The communications link supports upload and download of signal timings and other parameters and reporting of current intersection status. It represents the field equipment used in all levels of traffic signal control from basic actuated systems that operate on fixed timing plans through adaptive systems. It also supports all signalized intersection configurations, including those that accommodate pedestrians. In advanced, future implementations, environmental data may be monitored and used to support dilemma zone processing and other aspects of signal control that are sensitive to local environmental conditions. ITS Roadway Equipment
Roadway Transit Signal Control 'Roadway Transit Signal Control' includes the field elements that manage transit signals that are used when transit lanes or transit vehicles in mixed-traffic lanes have exclusive phases, including on transit lanes, transitways, or when a signal is used to give the transit vehicle a queue jump in mixed-traffic. These signals are visually distinct and positioned away from standard traffic control signal indications so they are not acted on by other road users. It includes the traffic signal controllers, detectors, conflict monitors, transit signal heads, and other ancillary equipment that supports transit signal control on mixed use alignments. The transit signal control may be separate and interconnected with the intersection control or integrated with overall intersection control (see Roadway Signal Control). ITS Roadway Equipment
RSE Intersection Management 'RSE Intersection Management' uses short range communications to support connected vehicle applications that manage signalized intersections. It communicates with approaching vehicles and ITS infrastructure (e.g., the traffic signal controller) to enhance traffic signal operations. Coordination with the ITS infrastructure also supports conflict monitoring to ensure the RSE output and traffic signal control output are consistent and degrade in a fail safe manner. Connected Vehicle Roadside Equipment
TIC Traffic Control Dissemination 'TIC Traffic Control Dissemination' disseminates intersection status, lane control information, special vehicle alerts, and other traffic control related information that is real-time or near real-time in nature and relevant to vehicles in a relatively local area on the road network. It collects traffic control information from Traffic Management and other Center(s) and disseminates the relevant information to vehicles and other mobile devices. Transportation Information Center
TMC Multi-Modal Coordination 'TMC Multi-Modal Coordination' supports center-to-center coordination between the Traffic Management and Transit Management Centers. It monitors transit operations and provides traffic signal priority for transit vehicles on request from the Transit Management Center. Traffic Management Center
TMC Signal Control 'TMC Signal Control' provides the capability for traffic managers to monitor and manage the traffic flow at signalized intersections. This capability includes analyzing and reducing the collected data from traffic surveillance equipment and developing and implementing control plans for signalized intersections. Control plans may be developed and implemented that coordinate signals at many intersections under the domain of a single Traffic Management Center and are responsive to traffic conditions and adapt to support incidents, preemption and priority requests, pedestrian crossing calls, etc. Traffic Management Center
Transit Center Priority Management 'Transit Center Priority Management' monitors transit schedule performance and generates requests for transit priority on routes and at certain intersections. It may coordinate with the Traffic Management Center to provide transit priority along the selected route, including allocation of dynamic lanes and granting signal priority. It also coordinates with the Transit Vehicle OBE to monitor and manage local transit signal priority requests at individual intersections. Transit Management Center
Transit Vehicle Signal Priority 'Transit Vehicle Signal Priority' provides the capability for transit vehicles to determine eligibility for priority and request signal priority at signalized intersections, ramps, and interchanges through short range communication with traffic control equipment at the roadside. Transit Vehicle OBE
Vehicle Basic Safety Communication 'Vehicle Basic Safety Communication' exchanges current vehicle characteristics, location, and motion (including past and intended maneuver) information with other vehicles in the vicinity, uses that information to calculate vehicle paths, and warns the driver when the potential for an impending collision is detected. If available, map data is used to filter and interpret the relative location and motion of vehicles in the vicinity. Information from on-board sensors (e.g., radars and image processing) are also used, if available, in combination with the V2V communications to detect non-equipped vehicles and corroborate connected vehicle data. This object represents a broad range of implementations ranging from basic Vehicle Awareness Devices that only broadcast vehicle location and motion and provide no driver warnings to advanced integrated safety systems that coordinate maneuvers and may, in addition to warning the driver, provide collision warning information to support automated control functions that can support control intervention. Vehicle
Vehicle Intersection Warning 'Vehicle Intersection Warning' uses V2V and V2I communications to monitor other connected vehicles at intersections and support the safe movement of the vehicle through the intersection. Driver warnings are provided and the application may also optionally take control of the vehicle to avoid collisions. The application will also notify the infrastructure and other vehicles if it detects an unsafe infringement on the intersection. Vehicle

Includes Information Flows:

Information Flow Description
arriving train information Information for a train approaching a highway-rail intersection that may include direction and allow calculation of approximate arrival time and closure duration.
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation.
intersection control status Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status.
intersection geometry The physical geometry of an intersection covering the location and width of each approaching lane, egress lane, and valid paths between approaches and egresses. This flow also defines the location of stop lines, cross walks, specific traffic law restrictions for the intersection (e.g., turning movement restrictions), and other elements that support calculation of a safe and legal vehicle path through the intersection.
intersection management application info Intersection and device configuration data, including intersection geometry, and warning parameters and thresholds. This flow also supports remote control of the application so the application can be taken offline, reset, or restarted.
intersection management application status Infrastructure application status reported by the RSE. This includes current operational state and status of the RSE and a log of operations.
intersection status Current signal phase and timing information for all lanes at a signalized intersection. This flow identifies active lanes and lanes that are being stopped and specifies the length of time that the current state will persist for each lane. It also identifies signal priority and preemption status and pedestrian crossing status information where applicable.
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection).
right-of-way request coordination The direct flow of information between field equipment. This includes notification of crossing calls from pedestrians and other vulnerable road users and requests for signal prioritization or preemption, and any other request for right-of-way at an intersection. The status of the request is also shared. For vulnerable road users, this includes information provided to guide and warn vulnerable road users at crossings including crossing permission status and crossing time remaining.
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way.
signal control commands Control of traffic signal controllers or field masters including clock synchronization.
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications.
signal priority service request A service request for vehicle priority issued to a traffic signal controller that results in green extension or other accommodation for the priority vehicle, within the current signal timing plan. The request includes the priority level, the desired time and duration of service, and the intended travel path through the intersection. This flow also allows the RSE to cancel a previously issued request for priority.
signal priority status In response to a request for signal priority, this flow indicates the status of the priority or preemption request.
track status Current status of the wayside equipment and notification of an arriving train.
traffic control priority request Request for signal priority at one or more intersections along a particular route.
traffic control priority status Status of signal priority request functions at the roadside (e.g., enabled or disabled).
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures.
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property.
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board.
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services.
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data.
transit vehicle operator signal indications Signal indications provided to the transit vehicle operator to support safe and efficient transit vehicle operation in mixed use alignments. Transit-specific signal indications are positioned so they are not visible to other road users or are visibly distinct from standard traffic control signal indications.
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle.
vehicle location and motion Data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size.

Goals and Objectives

Associated Planning Factors and Goals

Planning Factor Goal
A. Support the economic vitality of the metropolitan area, especially by enabling global competitiveness, productivity, and efficiency; Improve freight network
D. Increase the accessibility and mobility of people and for freight; Reduce congestion
E. Protect and enhance the environment, promote energy conservation, improve the quality of life, and promote consistency between transportation improvements and State and local planned growth and economic development patterns; Protect/Enhance the Environment
G. Promote efficient system management and operation; Improve efficiency
I. Improve the resiliency and reliability of the transportation system and reduce or mitigate stormwater impacts of surface transportation; Improve resiliency and reliability

Associated Objective Categories

Objective Category
System Efficiency: Delay
System Efficiency: Energy Consumption
System Efficiency: Intensity of Congestion (Travel Time Index)
System Efficiency: Travel Time
System Efficiency: Vehicle Miles Traveled
System Options: Travel Time - Transit Compared to Auto
System Reliability: Transit On-Time Performance
Transit Operations and Management: Transit Signal Priority

Associated Objectives and Performance Measures

Objective Performance Measure
Annual rate of change in regional average commute travel time will not exceed regional rate of population growth through the year Y. Average commute trip travel time (minutes).
Decrease system-wide signal delay on transit routes by X percent per year. System-wide signalized stop delay on transit routes.
Improve average on-time performance for specified transit routes/facilities by X percent within Y years. On-time performance of transit.
Improve average transit travel time compared to auto in major corridors by X minutes per year for Y years. Transit to auto travel time differential for a given period (daily, hourly, or peak hours), on a given portion of the system (system wide, by facility type, or by corridor).
Improve average travel time during peak periods by X percent by year Y. Average travel time during peak periods (minutes).
Increase implementation of transit signal priority strategies on X number of routes (or X number of intersections) over the next Y years. Number of transit routes/intersections equipped with transit signal priority capability.
Maintain a travel time differential between transit and auto during peak periods of X percent for Y years. Transit to auto travel time differential for a given period (daily, hourly, or peak hours), on a given portion of the system (system wide, by facility type, or by corridor).
Reduce excess fuel consumed due to congestion by X percent by year Y. Excess fuel consumed (total or per capita).
Reduce hours of delay per capita by X percent by year Y. Hours of delay (person-hours).
Reduce hours of delay per capita by X percent by year Y. Hours of delay per capita.
Reduce the regional average travel time index by X percent per year. Travel time index (the average travel time during the peak period, using congested speeds, divided by the off-peak period travel time, using posted or free-flow speeds).
Reduce the travel time differential between transit and auto during peak periods by X percent per year for Y years. Transit to auto travel time differential for a given period (daily, hourly, or peak hours), on a given portion of the system (system wide, by facility type, or by corridor).
Reduce total energy consumption per capita for transportation by X percent by year Y. Total energy consumed per capita for transportation.
Reduce total fuel consumption per capita for transportation by X percent by year Y. Total fuel consumed per capita for transportation.
Reduce vehicle miles traveled per capita by X percent by year Y. Average VMT per capita per day, per week, or per year.

 
Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.

Needs and Requirements

Need Functional Object Requirement
01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle. Roadway Signal Control 10 The field element shall receive request for transit vehicle signal priority.
Roadway Transit Signal Control 01 The field element shall receive track status and arriving train information from light rail wayside equipment. This may include the current status of the tracks and light rail vehicle location and expected time of arrival at the intersection.
02 The field element shall coordinate light rail arrival information with the traffic signal controller.
RSE Intersection Management 05 The field element shall receive transit signal priority requests from transit vehicles and forward to the traffic signal controller.
07 The field element shall determine when special vehicles requesting preemption or priority at a signal are authorized to do so based on their digital credentials.
TMC Signal Control 10 The center shall adjust signal timing in response to a signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other requests for right-of-way.
Transit Vehicle Signal Priority 01 The transit vehicle shall determine the schedule deviation and estimated times of arrival (ETA) at transit stops.
02 The transit vehicle shall send priority requests to traffic signal controllers at intersections, pedestrian crossings, and multimodal crossings on the roads (surface streets) and freeway (ramp controls) network that enable a transit vehicle schedule deviation to be corrected.
03 The transit vehicle shall send the schedule deviation data and status of priority requests to the transit vehicle operator and provide the capability for the transit vehicle operator to control the priority system.
04 The transit vehicle shall prevent a priority request from being sent when the transit vehicle cannot use the priority (e.g., when the transit vehicle makes a passenger stop on the approach to an intersection).
Vehicle Basic Safety Communication 06 The vehicle shall exchange location and motion information with roadside equipment and nearby vehicles.
Vehicle Intersection Warning 01 Vehicle shall provide vehicle path information to identify if vehicle is performing an unpermitted movement at an intersection such as a stop sign violation or running a red light.
02 Vehicle shall provide data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size.
02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle. TIC Traffic Control Dissemination 03 The center shall provide real time signal phase and timing information for all lanes at a signalized intersection to vehicle.
TMC Multi-Modal Coordination 01 The center shall respond to requests from transit management centers for signal priority at one or more intersections along a particular transit route.
02 The center shall exchange information with transit management centers including details current transit routes, the level of service on each route, and the progress of individual vehicles along their routes.
Transit Center Priority Management 02 The center shall send requests for priority along routes or at intersections to traffic management.
Vehicle Intersection Warning 01 Vehicle shall provide vehicle path information to identify if vehicle is performing an unpermitted movement at an intersection such as a stop sign violation or running a red light.
02 Vehicle shall provide data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size.
03 Transit Operations needs to provide transit vehicle data to Traffic Operations including loading information and schedule performance in order to support decision making regarding whether to give the transit vehicle priority at the intersection. Roadway Signal Control 08 The field element shall report current transit priority status to the center.
Transit Center Priority Management 01 The center shall analyze transit vehicle schedule performance to determine the need for priority along certain routes or at certain intersections.
03 The center shall define business rules that govern use of transit vehicle signal priority, communicate these rules to the transit vehicle, and monitor transit vehicle requests for priority at signalized intersections.
04 The center shall provide transit operations personnel with the capability to control and monitor transit signal priority operations.
04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently. Roadway Transit Signal Control 03 The field element shall coordinate light rail arrival information with adjacent intersections.
04 The field element shall control transit signals granting light rail access to the intersection, using signals that are visually distinct from standard traffic control signals.
RSE Intersection Management 01 The field element shall communicate with passing vehicles to provide the current signal phase and timing information for all lanes and approaches at a signalized intersection.
05 The field element shall receive transit signal priority requests from transit vehicles and forward to the traffic signal controller.
09 The field element shall collect current signal phase and timing data from the traffic signal controller.

Related Sources

Document Name Version Publication Date
ITS User Services Document 1/1/2005
CO-UMP Green Priority 5/31/2021
ConOps for Transit Connected Vehicle Draft 3/31/2012
Eco-Signal Operations: Operational Concept Final 10/1/2013
Multi-Modal Intelligent Traffic Signal System (MMITSS) ConOps Draft v2.0 9/14/2012
Multi-Modal Intelligent Traffic Signal System Final System Requirements Document Final 3/7/2013
Multi-Modal Intelligent Traffic Signal System- System Design Fi nal 6/26/2013


Security

In order to participate in this service package, each physical object should meet or exceed the following security levels.

Physical Object Security
Physical Object Confidentiality Integrity Availability Security Class
Connected Vehicle Roadside Equipment Moderate Moderate High Class 5
ITS Roadway Equipment Moderate High High Class 5
Other ITS Roadway Equipment Moderate Moderate Moderate Class 2
Traffic Management Center Moderate High Moderate Class 3
Transit Management Center Low Moderate Moderate Class 1
Transit Vehicle OBE Low Moderate Moderate Class 1
Transportation Information Center Not Applicable Low Moderate Class 1
Wayside Equipment Low High High Class 5



In order to participate in this service package, each information flow triple should meet or exceed the following security levels.

Information Flow Security
Source Destination Information Flow Confidentiality Integrity Availability
Basis Basis Basis
Connected Vehicle Roadside Equipment ITS Roadway Equipment signal priority service request Not Applicable Moderate Low
There is no sensitive or confidential information within this messages. Additionally, it could be inferred by observing either the presence of a transit vehicle near an intersection, or the effect on the timing of the intersection. This is also transmitted as a result of broadcast data. The RSE is transmitting a request to the ITS RE on behalf of a transit vehicle. It should only be making requests on behalf of an approved vehicle. A corrupted request may lead to a transit vehicle not receiving a green light after requesting it. In this case, this may lead to traffic delays. If an unapproved vehicle is able to forge these requests, they may cause larger scale traffic delays. If the ITS RE does not receive any requests, the vehicle may not receive the priority it requested. In the worst case scenario the transit vehicle would be forced to wait at some lights until they turned green. It would be more useful for a device to support this application, and only have some messages received, than to not support this application at all.
Connected Vehicle Roadside Equipment Traffic Management Center intersection management application status Moderate Moderate Low
This information could be of interest to a malicious individual who is attempting to determine the best way to accomplish a crime. As such it would be best to not make it easily accessible. May be LOW in some cases. If this is compromised, it could send unnecessary maintenance workers, or worse report plausible data that is erroneous. From THEA: should be able to cope with some bad information on the status and record of alerts/warnings; aggregate info; however could cause appearance of excessive traffic violations or unnecessary maintenance caused if data is compromised (operational state, status, log); should not affect the application functionality Incident status information should be presented in timely fashion as large scale mobility and safety issues are related. There are other mechanisms for reporting this information however, thus MODERATE. From THEA: Only limited adverse effect of info is not timely/readily available
Connected Vehicle Roadside Equipment Transit Vehicle OBE signal priority status Low Moderate Low
Not much could be learned by observing this flow, just the state of the priority request and the identity of the requester. Both of those are information that can be gleaned by physical observation, and give little advantage to an observer. Signal priority status information enables the receiving vehicle to proceed with more surety toward's its next stop; while there are obvious redundancies, a degree of confidence in the state of the message is required for user acceptance if nothing else. The most important aspect of this flow is the initiating request and hopefull success of that priority message; if that succeeds then the signal will turn in the vehicle's favor, making this flow a 'nice-to-have' that should be correct if it arrives, but is not necessary for the priority application to function.
ITS Roadway Equipment Connected Vehicle Roadside Equipment intersection control status Low High Moderate
This data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. If this is compromised, the Roadway Equipment and Roadside Equipment will be sending messages that are inconsistent with each other, leading to confusion and possible accidents. If this is down, the RSE doesn't get the information it needs to stay in synch with the actual signal state, reducing or eliminating the value add from having this application. The RSE must detect a lack of availability and choose not to send out-of-date information, so a failure of availability could be interpreted as having the same value as Integrity. However, this data is semi-predictable and there are other indicators (such as the lights themselves) of the intersection status.
From NYC, who believe this should be HIGH for some applications: If this is down, the RSE doesn't get the information it needs to stay in synch with the actual signal state, reducing or eliminating the value add from having this application. The RSE must detect a lack of availability and choose not to send out-of-date information, so a failure of availability cannot have worse consequences than a failure of integrity which we have previously assessed at HIGH.
ITS Roadway Equipment Other ITS Roadway Equipment right-of-way request coordination Moderate Moderate Moderate
Any control flow has some confidentiality requirement, as observation of the flow may enable an attacker to analyze and learn how to assume control. MODERATE for most flows as the potential damage is likely contained, though anything that could have a significant safety impact may be assigned HIGH. Since this directly impacts device control, we consider it the same as a control flow. Control flows, even for seemingly innocent devices, should have MODERATE integrity at minimum, just to guarantee that intended control messages are received. Incorrect, corrupted, intercepted and modified control messages can or will result in target field devices not behaving according to operator intent. The severity of this depends on the type of device, which is why some devices are set MODERATE and some HIGH. Since this directly impacts device control, we consider it the same as a control flow. Control flow availability is related to the criticality of being able to remotely control the device. For most devices, this is MODERATE. For purely passive devices with no incident relationship, this will be LOW. All devices should have default modes that enable them to operate without backhaul connectivity, so no device warrants a HIGH.
ITS Roadway Equipment Traffic Management Center right-of-way request notification Low Moderate Moderate
This can be reasonably guessed based on observing the ITS RE's environment. It is obvious when a bus approaches an intersection. Invalid messages could lead to an unauthorized user gaining signal priority at an intersection. This could also be used to delay traffic, which could lead to a financial impact on the community. However, the traffic signal will have controls in place to ensure that it does not display an illegal configuration (such as green in every direction). Even if all of the Right-of-way Requests are not passed along from an ITS RE, the intersection will still operate as normal. There are other existing methods to assist a right-of-way requesting vehicle safely traveling through an intersection, such as lights and sirens, which prevent this from being a HIGH. DISC: THEA and NYC believe this to be LOW: "not necessary for the app to work; can cope with not having immediately available data"
ITS Roadway Equipment Traffic Management Center signal control status Low High Moderate
The current conditions of an ITS RE are completely observable, by design. This influences the TMC response to a right-of-way request. It should be as accurate as the right-of-way request themselves. For some applications (ISIG) this need only be moderate. Per THEA: info needs to be accurate and should not be tampered to enable effective monitoring and control by the TMC. DISC: THEA believes this to be MODERATE: "info needs to be accurate and should not be tampered to enable effective monitoring and control by the TMC; should be as accurate as the right of way request". NYC:TMC doesn't play an active role in this application, i.e. even if the information contained in this flow were incorrect, it is unlikely to affect the outcome of this application one way or the other. On some applications NYC has this MODERATE though. RES: This value can obviously change a lot depending on the application context. The TMC will need the current status of the ITS RE in order to make an educated decision. If it is unavailable, the system is unable to operate. However, a few missed messages will not have a catastrophic impact. From NYC: TMC doesn't play an active role in this application, i.e. even if it is unavailable, it is unlikely to affect the outcome of this application one way or the other. RES: This value can change a lot depending on the application context.
ITS Roadway Equipment Transit Vehicle Operator driver information Not Applicable High Moderate
This data is sent to all drivers and is also directly observable, by design. This is the primary signal trusted by the driver to decide whether to go through the intersection and what speed to go through the intersection at; if it's wrong, accidents will happen. If the lights are out you have to get a policeman to direct traffic – expensive and inefficient and may cause a knock-on effect due to lack of coordination with other intersections.
ITS Roadway Equipment Transit Vehicle Operator transit vehicle operator signal indications Not Applicable High Moderate
This data is sent to all drivers and is also directly observable, by design. This is the primary signal trusted by the driver to decide whether to go through the intersection and what speed to go through the intersection at; if it's wrong, accidents could happen. If the lights are out you have to get a policeman to direct traffic – expensive and inefficient and may cause a cascading effect due to lack of coordination with other intersections.
Other ITS Roadway Equipment ITS Roadway Equipment right-of-way request coordination Moderate Moderate Moderate
Any control flow has some confidentiality requirement, as observation of the flow may enable an attacker to analyze and learn how to assume control. MODERATE for most flows as the potential damage is likely contained, though anything that could have a significant safety impact may be assigned HIGH. Since this directly impacts device control, we consider it the same as a control flow. Control flows, even for seemingly innocent devices, should have MODERATE integrity at minimum, just to guarantee that intended control messages are received. Incorrect, corrupted, intercepted and modified control messages can or will result in target field devices not behaving according to operator intent. The severity of this depends on the type of device, which is why some devices are set MODERATE and some HIGH. Since this directly impacts device control, we consider it the same as a control flow. Control flow availability is related to the criticality of being able to remotely control the device. For most devices, this is MODERATE. For purely passive devices with no incident relationship, this will be LOW. All devices should have default modes that enable them to operate without backhaul connectivity, so no device warrants a HIGH.
Traffic Management Center Connected Vehicle Roadside Equipment intersection management application info Moderate High Low
proprietary configuration data with warning parameters and thresholds should be accurate and not be tampered with; could enable outside control of application should be timely and readily available or may not be able to restart/reset; however, should be able to operate on a default configuration and/or stop sending messages
Traffic Management Center ITS Roadway Equipment signal control commands Moderate High Moderate
Control flows, even for seemingly innocent devices, should be kept confidential to minimize attack vectors. While an individual installation may not be particularly impacted by a cyberattack of its sensor network, another installation might be severely impacted, and different installations are likely to use similar methods, so compromising one leads to compromising all. DISC: NYC believes this to be LOW: "The result of this will be directly observable." Invalid messages could lead to an unauthorized user gaining control of an intersection. This could also be used to bring traffic to a standstill, which could lead to a large financial impact on the community. DISC: NYC believes this to be MODERATE: The signal timing is critical to the intersection operation; incorrect signal timing can lead to significant congestion and unreliable operation; while unsafe operation is controlled by the cabinet monitoring system, attackers could "freeze" the signal or call a preemption. RES: This will vary depending on the application and implementation. These messages are important to help with preemption and signal priority applications. Without them, these applications mayl not work. However, if these signals are not received, the ITS RE will continue to function using its default configuration. The TMC should have an acknowledgement of the receipt of a message. DISC: NYC blieves this to be LOW: TMC doesn't play an active role in this application, i.e. even if it is unavailable, it is unlikely to affect the outcome of this application one way or the other.
RES: This will vary depending on the application and implementation.
Traffic Management Center Transit Management Center traffic control priority status Low Moderate Moderate
This information is not sensitive. There are other indicators when an intersection supports transit signal priority. This information is important for the system to function correctly. If it is incorrect, it could lead to the transit system designing routes that do not take advantage of the optimizations. This information is necessary for the system to operate properly. There should be an acknowledgement of the message being received.
Traffic Management Center Transportation Information Center intersection status Not Applicable Moderate Moderate
This data is distributed using a variety of mechanisms, some of which are localized broadcast; it is desireable that all potential users get this information. If this flow is not accurate or delivered in a timely fashion then a large variety of mobility and safety services that depend on it will not work properly. If this flow is not accurate or delivered in a timely fashion then a large variety of mobility and safety services that depend on it will not work properly.
Transit Management Center Traffic Management Center traffic control priority request Low Moderate Moderate
The result of this will be directly observable. Invalid messages could lead to an unauthorized user gaining transit signal priority at an intersection. This could also be used to delay traffic, which could lead to a financial impact on the community. However, the traffic signal will have controls in place to ensure that it does not display an illegal configuration (such as green in every direction). These messages are important to help with the transit signal priority application. Without them, it will not work. However, if these signals are not received, the ITS RE will continue to function using its default configuration. The Transit Management Center should have an acknowledgement of the receipt of a message.
Transit Management Center Transit Operations Personnel transit operations status Moderate High High
Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system.
Transit Management Center Transit Vehicle OBE transit schedule information Low Moderate Moderate
This information is not sensitive. It is generally made public, to support transit system functionality. This data contains the vehicle assignment. It should be accurate, and not easily modified. However, the bus drivers will have some knowledge about what a reasonable configuration is, and should be able to notice any unusual configurations, such as all busses being a #27. This information is necessary for the TSP to work correctly. A few missed messages will not have a large impact. The Transit Management Center needs to know if the TV OBE does not receive the message, so it can resend it.
Transit Operations Personnel Transit Management Center transit operations personnel input Moderate High High
Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system.
Transit Vehicle OBE Connected Vehicle Roadside Equipment local signal priority request Not Applicable Moderate Low
This information can be observed. Only approved vehicles should be allowed to make these requests to the RSE. A corrupted request may lead to a transit vehicle not receiving a green light after requesting it. In this case, this may lead to traffic delays. If an unapproved vehicle is able to forge these requests, they may cause larger scale traffic delays. If the RSE does not receive any requests, the vehicle may not receive the priority it requested. In the worst case scenario the transit vehicle would be forced to wait at some lights until they turned green. It would be more useful for a device to support this application, and only have some messages received, than to not support this application at all.
Transit Vehicle OBE ITS Roadway Equipment local signal priority request Not Applicable Moderate Low
This information can be observed. nly approved vehicles should be allowed to make these requests to the RSE. A corrupted request may lead to a transit vehicle not receiving a green light after requesting it. In this case, this may lead to traffic delays. If an unapproved vehicle is able to forge these requests, they may cause larger scale traffic delays. If the RSE does not receive any requests, the vehicle may not receive the priority it requested. In the worst case scenario the transit vehicle would be forced to wait at some lights until they turned green. It would be more useful for a device to support this application, and only have some messages received, than to not support this application at all.
Transit Vehicle OBE Transit Management Center transit vehicle schedule performance Low Moderate Low
This information is directly observable, and in most instances it is made publically available. This information may be used to influence the decision about whether or not to make a traffic control priority request on behalf of the transit vehicle. If it is incorrect it may cause the transit management center to send out incorrect traffic control priority requests, which may delay traffic. There should not be any catastrophic failures caused if this data is occasionally missing.
Transit Vehicle OBE Transit Vehicle Operator transit vehicle operator display Low Moderate Low
This should not include any sensitive information. It would be possible for a person standing behind the driver to observe the information transmitted. Some minimal guarantee of data integrity is necessary for all C-ITS flows. This entire application should not directly affect the drivers driving habits. The operator should still be slowing and stopping at yellow or red lights, along with observing all other driving regulations. DISC: Original V2I analysis classified this as LOW. Even if the operator is not made aware of the signal preemption, the system should still operate correctly. The operator should be using the traffic lights to influence their decision about whether or not to stop, not the display.
Transit Vehicle Operator Transit Vehicle OBE transit vehicle operator input Low Moderate Low
This information is transmitted through systems on board the Transit Vehicle. Even if the vehicle were compromised and these communications monitored, most of this information is directly observable. Some minimal guarantee of data integrity is necessary for all C-ITS flows. If this is compromised, it could result in an incorrect signal priority request, which has minimal impact. DISC: Original V2I analysis classified this as LOW. A delay in reporting this may result in a signal priority request not going through, which has minimal impact.
Wayside Equipment Connected Vehicle Roadside Equipment arriving train information Not Applicable High High
Trains arriving should be visible, viewable and certainly not concealed. This flow is an intermediate to the end user, but may also be used by an intermediary process for some other action. Regardless, it forms the basis for providing data that, if incorrect, could lead to a catastrophic mistake. This flow is an intermediate to the end user, but may also be used by an intermediary process for some other action. Regardless, it forms the basis for providing data that, if incorrect, could lead to a catastrophic mistake. Since this flow can lead to other actions with other effects, HIGH is justifiable.
Wayside Equipment Connected Vehicle Roadside Equipment track status Low Moderate Moderate
Track status is typically physically viewable information. This information is important, but if it is incorrecct there are other safety systems that should prevent related incidents. The impact of any rail/road intersection is particularly high, but in this case a MODERATE rating can be justified by the alternative mechanisms. This information is important, but if it is not reported there are other safety systems that should prevent related incidents. The impact of any rail/road intersection is particularly high, but in this case a MODERATE rating can be justified by the alternative mechanisms.
Wayside Equipment ITS Roadway Equipment arriving train information Not Applicable High High
Trains arriving should be visible, viewable and certainly not concealed. This flow is an intermediate to the end user, but may also be used by an intermediary process for some other action. Regardless, it forms the basis for providing data that, if incorrect, could lead to a catastrophic mistake. This flow is an intermediate to the end user, but may also be used by an intermediary process for some other action. Regardless, it forms the basis for providing data that, if incorrect, could lead to a catastrophic mistake. Since this flow can lead to other actions with other effects, HIGH is justifiable.
Wayside Equipment ITS Roadway Equipment track status Low Moderate Moderate
Track status is typically physically viewable information. This information is important, but if it is incorrect there are other safety systems that should prevent related incidents. The impact of any rail/road intersection is particularly high, but in this case a MODERATE rating can be justified by the alternative mechanisms. This information is important, but if it is not reported there are other safety systems that should prevent related incidents. The impact of any rail/road intersection is particularly high, but in this case a MODERATE rating can be justified by the alternative mechanisms.

Standards

The following table lists the standards associated with physical objects in this service package. For standards related to interfaces, see the specific information flow triple pages.

Name Title Physical Object
CTI 4001 RSU Roadside Unit (RSU) Standard Connected Vehicle Roadside Equipment
ITE 5201 ATC Advanced Transportation Controller ITS Roadway Equipment
ITE 5202 ATC Model 2070 Model 2070 Controller Standard ITS Roadway Equipment
ITE 5301 ATC ITS Cabinet Intelligent Transportation System Standard Specification for Roadside Cabinets ITS Roadway Equipment
ITE 5401 ATC API Application Programming Interface Standard for the Advanced Transportation Controller ITS Roadway Equipment
NEMA TS 8 Cyber and Physical Security Cyber and Physical Security for Intelligent Transportation Systems ITS Roadway Equipment
Traffic Management Center
NEMA TS2 Traffic Controller Assemblies Traffic Controller Assemblies with NTCIP Requirements ITS Roadway Equipment




System Requirements

System Requirement Need
001 The system shall provide real time signal phase and timing information for all lanes at a signalized intersection to vehicle. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
002 The system shall respond to requests from transit management centers for signal priority at one or more intersections along a particular transit route. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
003 The system shall exchange information with transit management centers including details current transit routes, the level of service on each route, and the progress of individual vehicles along their routes. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
004 The system shall adjust signal timing in respond to a signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other requests for right-of-way. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
005 The system shall analyze transit vehicle schedule performance to determine the need for priority along certain routes or at certain intersections. 03 Transit Operations needs to provide transit vehicle data to Traffic Operations including loading information and schedule performance in order to support decision making regarding whether to give the transit vehicle priority at the intersection.
006 The system shall send requests for priority along routes or at intersections to traffic management. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
007 The system shall define business rules that govern use of transit vehicle signal priority, communicate these rules to the transit vehicle, and monitor transit vehicle requests for priority at signalized intersections. 03 Transit Operations needs to provide transit vehicle data to Traffic Operations including loading information and schedule performance in order to support decision making regarding whether to give the transit vehicle priority at the intersection.
008 The system shall provide transit operations personnel with the capability to control and monitor transit signal priority operations. 03 Transit Operations needs to provide transit vehicle data to Traffic Operations including loading information and schedule performance in order to support decision making regarding whether to give the transit vehicle priority at the intersection.
009 The system shall report current transit priority status to the center. 03 Transit Operations needs to provide transit vehicle data to Traffic Operations including loading information and schedule performance in order to support decision making regarding whether to give the transit vehicle priority at the intersection.
010 The system shall receive request for transit vehicle signal priority. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
011 The system shall communicate with passing vehicles to provide the current signal phase and timing information for all lanes and approaches at a signalized intersection. 04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently.
012 The system shall receive track status and arriving train information from light rail wayside equipment. This may include the current status of the tracks and light rail vehicle location and expected time of arrival at the intersection. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
013 The system shall coordinate light rail arrival information with the traffic signal controller. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
014 The system shall receive transit signal priority requests from transit vehicles and forward to the traffic signal controller 04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently.
01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
015 The system shall determine when special vehicles requesting preemption or priority at a signal are authorized to do so based on their digital credentials. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
016 The system shall coordinate light rail arrival information with adjacent intersections. 04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently.
017 The system shall collect current signal phase and timing data from the traffic signal controller. 04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently.
018 The system shall control transit signals granting light rail access to the intersection, using signals that are visually distinct from standard traffic control signals. 04 The Transit Vehicle Operator needs to progress through his arterial route safely and efficiently.
019 The system shall determine the schedule deviation and estimated times of arrival (ETA) at transit stops. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
020 The system shall send priority requests to traffic signal controllers at intersections, pedestrian crossings, and multimodal crossings on the roads (surface streets) and freeway (ramp controls) network that enable a transit vehicle schedule deviation to be corrected. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
021 The system shall send the schedule deviation data and status of priority requests to the transit vehicle operator and provide the capability for the transit vehicle operator to control the priority system. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
022 The system shall prevent a priority request from being sent when the transit vehicle cannot use the priority (e.g., when the transit vehicle makes a passenger stop on the approach to an intersection). 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
023 The system shall exchange location and motion information with roadside equipment and nearby vehicles. 01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
024 The system shall provide vehicle path information to identify if vehicle is performing an unpermitted movement at an intersection such as a stop sign violation or running a red light. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
025 The system shall provide data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size. 02 Transit Operations needs to provide approaching Transit Vehicle location and heading to traffic operations so that they can adjust the signal controller signal timing in favor of the transit vehicle.
01 Transit Operations needs to provide approaching Transit Vehicle location and heading to the roadside signal controller so that the controller can modify signal timing in favor of the transit vehicle.
 

Implementations


PT09.1 Traditional Field Control Implementation

Signal Priority based on direct communication between the Transit Vehicle and ITS Roadway Equipment

Traditional Field Control Implementation Flows

Information FlowDescriptionInclusion Status
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). Fundamental
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way. Optional
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Optional
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Optional
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Optional


Traditional Field Control Implementation Functional Objects

Functional Object
Roadway Signal Control
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


Back to Implementation List

PT09.2 Traditional TMC Control Implementation

Signal Priority managed in real-time by TMC based on direct communication between the Transit Vehicle and ITS Roadway Equipment.

Traditional TMC Control Implementation Flows

Information FlowDescriptionInclusion Status
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). Fundamental
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way. Fundamental
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Fundamental
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Fundamental
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Optional


Traditional TMC Control Implementation Functional Objects

Functional Object
Roadway Signal Control
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


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PT09.3 Center Control Implementation

Signal Priority granted based on negotiation between the Transit Management Center and Traffic Management Center

Center Control Implementation Flows

Information FlowDescriptionInclusion Status
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). Optional
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Fundamental
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Fundamental
traffic control priority request Request for signal priority at one or more intersections along a particular route. Fundamental
traffic control priority status Status of signal priority request functions at the roadside (e.g., enabled or disabled). Fundamental
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Fundamental


Center Control Implementation Functional Objects

Functional Object
Roadway Signal Control
TMC Multi-Modal Coordination
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


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PT09.4 C-ITS Field Control Implementation

Signal Priority based on direct communication between the Transit Vehicle and ITS Roadway Equipment via Connected Vehicle Roadside Equipment

C-ITS Field Control Implementation Flows

Information FlowDescriptionInclusion Status
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
intersection control status Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status. Fundamental
intersection geometry The physical geometry of an intersection covering the location and width of each approaching lane, egress lane, and valid paths between approaches and egresses. This flow also defines the location of stop lines, cross walks, specific traffic law restrictions for the intersection (e.g., turning movement restrictions), and other elements that support calculation of a safe and legal vehicle path through the intersection. Optional
intersection management application info Intersection and device configuration data, including intersection geometry, and warning parameters and thresholds. This flow also supports remote control of the application so the application can be taken offline, reset, or restarted. Fundamental
intersection management application status Infrastructure application status reported by the RSE. This includes current operational state and status of the RSE and a log of operations. Fundamental
intersection status Current signal phase and timing information for all lanes at a signalized intersection. This flow identifies active lanes and lanes that are being stopped and specifies the length of time that the current state will persist for each lane. It also identifies signal priority and preemption status and pedestrian crossing status information where applicable. Optional
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). Fundamental
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way. Optional
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Optional
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Optional
signal priority service request A service request for vehicle priority issued to a traffic signal controller that results in green extension or other accommodation for the priority vehicle, within the current signal timing plan. The request includes the priority level, the desired time and duration of service, and the intended travel path through the intersection. This flow also allows the RSE to cancel a previously issued request for priority. Fundamental
signal priority status In response to a request for signal priority, this flow indicates the status of the priority or preemption request. Optional
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Optional
vehicle location and motion Data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size. Optional


C-ITS Field Control Implementation Functional Objects

Functional Object
Roadway Signal Control
RSE Intersection Management
TIC Traffic Control Dissemination
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


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PT09.5 C-ITS Center Control Implementation

Signal Priority is TMC-controlled and Connected Vehicle Roadside Equipment is used to coordinate priority status with transit vehicles at the intersection. Optionally, the Transit Management Center can coordinate signal priority in this center-based approach.

C-ITS Center Control Implementation Flows

Information FlowDescriptionInclusion Status
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
intersection control status Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status. Fundamental
intersection geometry The physical geometry of an intersection covering the location and width of each approaching lane, egress lane, and valid paths between approaches and egresses. This flow also defines the location of stop lines, cross walks, specific traffic law restrictions for the intersection (e.g., turning movement restrictions), and other elements that support calculation of a safe and legal vehicle path through the intersection. Optional
intersection management application info Intersection and device configuration data, including intersection geometry, and warning parameters and thresholds. This flow also supports remote control of the application so the application can be taken offline, reset, or restarted. Fundamental
intersection management application status Infrastructure application status reported by the RSE. This includes current operational state and status of the RSE and a log of operations. Fundamental
intersection status Current signal phase and timing information for all lanes at a signalized intersection. This flow identifies active lanes and lanes that are being stopped and specifies the length of time that the current state will persist for each lane. It also identifies signal priority and preemption status and pedestrian crossing status information where applicable. Optional
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). Fundamental
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way. Fundamental
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Fundamental
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Fundamental
signal priority service request A service request for vehicle priority issued to a traffic signal controller that results in green extension or other accommodation for the priority vehicle, within the current signal timing plan. The request includes the priority level, the desired time and duration of service, and the intended travel path through the intersection. This flow also allows the RSE to cancel a previously issued request for priority. Fundamental
signal priority status In response to a request for signal priority, this flow indicates the status of the priority or preemption request. Optional
traffic control priority request Request for signal priority at one or more intersections along a particular route. Optional
traffic control priority status Status of signal priority request functions at the roadside (e.g., enabled or disabled). Optional
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Optional
vehicle location and motion Data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size. Optional


C-ITS Center Control Implementation Functional Objects

Functional Object
Roadway Signal Control
RSE Intersection Management
TIC Traffic Control Dissemination
TMC Multi-Modal Coordination
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


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PT09.6 Light Rail Signal Priority Implementation

Signal priority implementations for light rail include several unique options. Wayside equipment may notify the traffic control system that a light rail vehicle is approaching that will require priority. Also, the light rail operator may be provided unique signal indications (e.g., horizontal and vertical bar signals) that differ from the traditional signal indications used by other motorists at the intersection. Also, the traffic signal system may benefit from advanced notice of signal priority requests in order to grant priority with reduced impact to other traffic, so this implementation includes coordination between upstream and downstream signals, represented in ARC-IT with an interface to Other ITS Roadway Equipment.

Light Rail Signal Priority Implementation Flows

Information FlowDescriptionInclusion Status
arriving train information Information for a train approaching a highway-rail intersection that may include direction and allow calculation of approximate arrival time and closure duration. At Least One
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. Fundamental
intersection control status Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status. At Least One
intersection geometry The physical geometry of an intersection covering the location and width of each approaching lane, egress lane, and valid paths between approaches and egresses. This flow also defines the location of stop lines, cross walks, specific traffic law restrictions for the intersection (e.g., turning movement restrictions), and other elements that support calculation of a safe and legal vehicle path through the intersection. Optional
intersection management application info Intersection and device configuration data, including intersection geometry, and warning parameters and thresholds. This flow also supports remote control of the application so the application can be taken offline, reset, or restarted. At Least One
intersection management application status Infrastructure application status reported by the RSE. This includes current operational state and status of the RSE and a log of operations. At Least One
intersection status Current signal phase and timing information for all lanes at a signalized intersection. This flow identifies active lanes and lanes that are being stopped and specifies the length of time that the current state will persist for each lane. It also identifies signal priority and preemption status and pedestrian crossing status information where applicable. Optional
local signal priority request Request from a vehicle to a signalized intersection for priority at that intersection. This flow also allows the vehicle to cancel a priority request (for example, when the vehicle clears the intersection). At Least One
right-of-way request coordination The direct flow of information between field equipment. This includes notification of crossing calls from pedestrians and other vulnerable road users and requests for signal prioritization or preemption, and any other request for right-of-way at an intersection. The status of the request is also shared. For vulnerable road users, this includes information provided to guide and warn vulnerable road users at crossings including crossing permission status and crossing time remaining. Optional
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way. Optional
signal control commands Control of traffic signal controllers or field masters including clock synchronization. Optional
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications. Optional
signal priority service request A service request for vehicle priority issued to a traffic signal controller that results in green extension or other accommodation for the priority vehicle, within the current signal timing plan. The request includes the priority level, the desired time and duration of service, and the intended travel path through the intersection. This flow also allows the RSE to cancel a previously issued request for priority. At Least One
signal priority status In response to a request for signal priority, this flow indicates the status of the priority or preemption request. Optional
track status Current status of the wayside equipment and notification of an arriving train. At Least One
traffic control priority request Request for signal priority at one or more intersections along a particular route. Optional
traffic control priority status Status of signal priority request functions at the roadside (e.g., enabled or disabled). Optional
transit operations personnel input User input from transit operations personnel including instructions governing service availability, schedules, emergency response plans, transit personnel assignments, transit maintenance requirements, and other inputs that establish general system operating requirements and procedures. Optional
transit operations status Presentation of information to transit operations personnel including accumulated schedule and fare information, ridership and on-time performance information, emergency response plans, transit personnel information, maintenance records, and other information intended to support overall planning and management of a transit property. Optional
transit schedule information Current and projected transit schedule information used to initialize the transit vehicle with a vehicle assignment, monitor schedule performance, and develop corrective actions on-board. Optional
transit vehicle operator display Visual, audible, and tactile outputs to the transit vehicle operator including vehicle surveillance information, alarm information, vehicle system status, information from the operations center, and information indicating the status of all other on-board ITS services. Optional
transit vehicle operator input Transit vehicle operator inputs to on-board ITS equipment, including tactile and verbal inputs. Includes authentication information, on-board system control, emergency requests, and fare transaction data. Optional
transit vehicle operator signal indications Signal indications provided to the transit vehicle operator to support safe and efficient transit vehicle operation in mixed use alignments. Transit-specific signal indications are positioned so they are not visible to other road users or are visibly distinct from standard traffic control signal indications. Optional
transit vehicle schedule performance Estimated times of arrival and anticipated schedule deviations reported by a transit vehicle. Optional
vehicle location and motion Data describing the vehicle's location in three dimensions, heading, speed, acceleration, braking status, and size. Optional


Light Rail Signal Priority Implementation Functional Objects

Functional Object
Roadway Signal Control
Roadway Transit Signal Control
RSE Intersection Management
TIC Traffic Control Dissemination
TMC Signal Control
Transit Center Priority Management
Transit Vehicle Signal Priority
Vehicle Basic Safety Communication
Vehicle Intersection Warning


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