Link Type: Short Range Wireless

Roadside Equipment --> ITS Roadway Equipment:
intersection status monitoring


intersection status monitoring (Information Flow): Current signal phase and timing information for all lanes at a signalized intersection. This flow represents monitoring of communications by a receiver at the intersection to support monitoring for conflicts between actual signal states and RSE communications about those states.

Roadside Equipment (Source Physical Object): 'Roadside Equipment' (RSE) represents the Connected Vehicle roadside devices that are used to send messages to, and receive messages from, nearby vehicles using Dedicated Short Range Communications (DSRC) or other alternative wireless communications technologies. 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 (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.

Communication Diagrams

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This profile describes a set of standards applicable to broadcast, frequent (non-constant), medium latency vehicle- to-vehicle and vehicle-to-infrastructure communications using the User Datagram Protocol (UDP) over Internet Protocol version 6 (IPv6) over the 5.9GHz spectrum.



Characteristic Value
Time Context Now
Spatial Context Adjacent
Acknowledgement False
Cardinality Unicast
Initiator Source


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

Information Flow Security
Application Confidentiality Integrity Availability
Basis Basis Basis
Pedestrian in Signalized Crosswalk Warning Low Moderate Moderate
This information could be ascertained by examining the signal states, and so is effectively broadcast. If this is compromised, the RSE could send incorrect data to the Roadway Equipment. Since the data contained herein directly affects human safety, the Roadway Equipment may react to tell the RSE it is in conflict, which in turn may result in the RSE modifying or disabling its outputs. A delay in reporting this may allow the RSE to distribute faulty information, but that information is contradicted by the signal state. Since there are multiple pathways for the information to be obtained, this is not 'High.