Physical Object: ITS Roadway Equipment

Roadway Speed Monitoring and Warning

Overview

'Roadway Speed Monitoring and Warning' includes the field elements that monitor vehicle speeds. If the speed is determined to be excessive, an advisory or warning is displayed. Current environmental conditions and other factors that may reduce safe operating speeds may also be taken into account. The operational status (state of the device, configuration, and fault data) is provided to the center. This application can also provide an enforcement function, reporting speed violations to an enforcement agency.

This functional object is included in the "ITS Roadway Equipment" physical object.

This functional object is included in the following service packages:

This functional object is mapped to the following Functional View PSpecs:

Requirements

# Requirement
01 The field element shall include sensors to detect vehicle speeds, under traffic or maintenance center control.
02 The field element shall include sensors to detect vehicle speeds, under enforcement agency control.
03 If the speed detected by vehicle speed sensors is determined to be excessive, the field element shall provide a safe speed advisory to passing drivers via a driver information system (such as portable messages signs, field to vehicle communications to in-vehicle signing systems, etc.).
04 The field element shall base speed advisories to passing drivers on environmental conditions.
05 The field element shall monitor notify an enforcement agency when a speed violation is detected.
06 The field element shall return operational status for the vehicle speed sensors to the controlling traffic or maintenance center; including measured speeds, warning messages displayed, and violation records.
07 The field element shall return operational status for the vehicle speed sensors to the enforcement agency.
08 The field element shall return fault data for the vehicle speed sensors to the controlling center for repair.
09 The field element shall provide speed advisories to passing drivers.

Information Flows

Source Flow Destination
Connected Vehicle Roadside Equipment roadway dynamic signage data ITS Roadway Equipment
Enforcement Center automated enforcement parameters ITS Roadway Equipment
Enforcement Center speed monitoring control ITS Roadway Equipment
ITS Roadway Equipment driver information Commercial Vehicle Driver
ITS Roadway Equipment reduced speed warning info Connected Vehicle Roadside Equipment
ITS Roadway Equipment roadway dynamic signage status Connected Vehicle Roadside Equipment
ITS Roadway Equipment vehicle signage local data Connected Vehicle Roadside Equipment
ITS Roadway Equipment driver information Driver
ITS Roadway Equipment driver information Emergency Personnel
ITS Roadway Equipment speed monitoring information Enforcement Center
ITS Roadway Equipment violation notification Enforcement Center
ITS Roadway Equipment driver information Light Vehicle Driver
ITS Roadway Equipment roadway dynamic signage status Maint and Constr Management Center
ITS Roadway Equipment speed monitoring information Maint and Constr Management Center
ITS Roadway Equipment roadway dynamic signage status Maint and Constr Vehicle OBE
ITS Roadway Equipment driver information Maint and Constr Vehicle Operator
ITS Roadway Equipment roadway dynamic signage status Traffic Management Center
ITS Roadway Equipment speed monitoring information Traffic Management Center
ITS Roadway Equipment driver information Transit Vehicle Operator
Maint and Constr Management Center roadway dynamic signage data ITS Roadway Equipment
Maint and Constr Management Center speed monitoring control ITS Roadway Equipment
Maint and Constr Vehicle OBE roadway dynamic signage data ITS Roadway Equipment
Traffic Management Center roadway dynamic signage data ITS Roadway Equipment
Traffic Management Center speed monitoring control ITS Roadway Equipment
Vehicle Characteristics vehicle characteristics ITS Roadway Equipment

Standards

The following table lists the standards associated with the functional object itself (as opposed to standards associated with an interface).

Name Title
NEMA TS4 Hardware Standards for DMS Hardware Standards for Dynamic Message Signs (DMS) With NTCIP Requirements