Physical Object: Traffic Management Center

TMC Variable Speed Limits

Overview

'TMC Variable Speed Limits' provides center monitoring and control of variable speed limits systems. It monitors data on traffic and environmental conditions collected from sensors along the roadway. Based on the measured data, it calculates and sets suitable speed limits usually by lane. It controls equipment that posts the current speed limits and displays additional information such as basic safety rules and current traffic information to drivers.

This functional object is included in the "Traffic Management Center" 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 center shall monitor data on traffic and environmental conditions collected from sensors along the roadway.
02 Based on the measured data, the center shall calculate and set suitable speed limits by lane.
03 The center shall control field equipment that posts the current speed limits and displays additional information such as basic safety rules and current traffic information to drivers.
04 The center shall monitor the operational status of the variable speed limit equipment, including fault reports.
05 The center shall provide center personnel current system status and respond to control data from center personnel regarding variable speed limits.
06 The center shall provide the current speed limits and additional information such as basic safety rules and current traffic information to drivers.

Information Flows

Source Flow Destination
Connected Vehicle Roadside Equipment speed management application status Traffic Management Center
Connected Vehicle Roadside Equipment speed warning application status Traffic Management Center
ITS Roadway Equipment variable speed limit status Traffic Management Center
Traffic Management Center road network conditions Commercial Vehicle Administration Center
Traffic Management Center road network conditions Emergency Management Center
Traffic Management Center road network conditions Emissions Management Center
Traffic Management Center road network conditions Fleet and Freight Management Center
Traffic Management Center road network conditions Maint and Constr Management Center
Traffic Management Center road network conditions Other Traffic Management Centers
Traffic Management Center road network conditions Transit Management Center
Traffic Management Center road network conditions Transportation Information Center
Traffic Management Center speed management application information Connected Vehicle Roadside Equipment
Traffic Management Center speed management information Transportation Information Center
Traffic Management Center speed warning application info Connected Vehicle Roadside Equipment
Traffic Management Center traffic operator data Traffic Operations Personnel
Traffic Management Center variable speed limit control ITS Roadway Equipment
Traffic Operations Personnel traffic operator input Traffic Management Center
Transportation Information Center road network environmental situation data Traffic Management Center

Standards

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

Name Title
NEMA TS 8 Cyber and Physical Security Cyber and Physical Security for Intelligent Transportation Systems