Traffic Management Center --> ITS Roadway Equipment:
signal control commands

Definitions

signal control commands (Information Flow): Control of traffic signal controllers or field masters including clock synchronization.

Traffic Management Center (Source 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.

ITS Roadway Equipment (Destination 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 itself. In CVRIA, this physical object represents all of the other ITS field equipment that interfaces with and supports the Connected Vehicle Roadside Equipment (RSE). 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.

Included In

This Information Flow is in the following Applications:

• Eco-Approach and Departure at Signalized Intersections
• Eco-Traffic Signal Timing
• Eco-Transit Signal Priority
• Emergency Vehicle Preemption
• Freight Signal Priority
• Intelligent Traffic Signal System
• Pedestrian Mobility
• Red Light Violation Warning
• Transit Signal Priority

This Information Flow is in the following Application Objects:

• Roadway Signal Control
• TMC Signal Control

Communication Diagrams

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This profile describes applicable standards for communicating between with ITS Roadway devices using the simple network management protocol (SNMP).




This profile describes an alternative set of standards used to communicate with ITS Roadway Devices that uses the NTCIP Octet Encoding Rules (OER), a standard developed specifically for the transportation industry. This template is used primarily for communication with traffic signal controllers, where second-per-second communications is required. This template also includes standards for SNMP traps, that allows an ITS Roadway Device to initiate event-driven communications with a receiver.

Characteristics

Architectural:

Security

This information flow triple is in the following applications with the following security levels.