ITS Roadway Equipment --> Traffic Management Center:
variable speed limit status

Definitions

variable speed limit status (Information Flow): Current operating status of the variable speed limit systems including the state of the equipment.

ITS Roadway Equipment (Source Physical Object): '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.

Traffic Management Center (Destination Physical Object): 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.

Included In

This Triple is in the following Service Packages:

• TM20: Variable Speed Limits
• TM21: Speed Harmonization
• WX03: Spot Weather Impact Warning

This triple is associated with the following Functional Objects:

• Roadway Variable Speed Limits
• TMC Environmental Monitoring
• TMC Variable Speed Limits

This Triple is described by the following Functional View Data Flows:

• variable_speed_limit_status

This Triple has the following triple relationships:

Communication Solutions

• AU: DMS and RWIS data - DMS and RWIS Comms (0)
• EU: UTMC Data - UTMC (3)
• US: NTCIP Message Sign - SNMPv3/TLS (5)
• US: NTCIP Message Sign - SNMPv1/TLS (6)
• US: NTCIP Message Sign - SNMPv1 (32)
• Data for Distribution (TBD) - Apache Kafka (44)
• Data for Distribution (TBD) - OMG DDS (44)
• Data for Distribution (TBD) - OASIS MQTT (50)
• Data for Distribution (TBD) - OASIS AMQP (61)

Selected Solution

Data for Distribution (TBD) - OMG DDS

Solution Description

ITS Application Entity Development needed			Click gap icons for more info.
Mgmt OMG DDS	Facilities OMG DDS OMG DDS-RPC OMG DDSI-RTPS	Security OMG DDS-Security
	TransNet IETF RFC 768 IP Alternatives
	Access Internet Subnet Alternatives

Note that some layers might have alternatives, in which case all of the gap icons associated with every alternative may be shown on the diagram, but the solution severity calculations (and resulting ordering of solutions) includes only the issues associated with the default (i.e., best, least severe) alternative.

Characteristics

Security