Interface: ODOT Traffic Signal Roadway Equipment - ODOT / KYTC Connected Vehicle Roadside Equipment

ODOT Traffic Signal Roadway Equipment to ODOT / KYTC Connected Vehicle Roadside Equipment Interface Diagram

Information Flow Definitions

conflict monitor status  (Planned)  Selected Comm Solution

A control flow that supports failsafe operation in the event that a conflict is detected that requires the RSE to enter a failsafe operating mode for intersection management. Analogous to a traffic signal conflict monitor, this flow is issued when differences are detected between information provided to the vehicle for in–vehicle display and information displayed by field devices. It contains the details of differences that were found.

intersection control status  (Planned)  Selected Comm Solution

Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status.

intersection infringement info  (Planned)  Selected Comm Solution

Vehicle path information sent by a vehicle that is performing an unpermitted movement at an intersection such as a stop sign violation or running a red light. This also includes information about possible conflicts with other road users in the vehicle's path, including a range of uncontrolled intersection scenarios that could be covered by this flow. This flow does not include permanent ids; only temporary ones that allow monitoring of the vehicle as it moves across the intersection.

intersection status monitoring  (Planned)  Selected Comm Solution

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.

mixed use crossing status  (Planned)  Selected Comm Solution

Current pedestrian and other mixed use crossing information including an indication of whether the call button has been activated, the current state of the mixed use crossing signal, and information indicating whether non–motorized users are currently occupying the cross walk.

personal location information  (Planned)  Selected Comm Solution

Pedestrian, bicyclist, and other non–motorized user locations at an intersection as detected and reported by an RSE.

signal preemption request  (Planned)  Selected Comm Solution

Direct request for preemption to a traffic signal controller that results in preemption of the current control plan and grants right–of–way to the requesting vehicle. This flow identifies the required phase and timing of the preemption. This flow may also cancel the preemption request (e.g., when the requesting vehicle clears the intersection).

signal priority service request  (Planned)  Selected Comm Solution

A service request for vehicle priority issued to a traffic signal controller that results in green extension or other accommodation for the priority vehicle, within the current signal timing plan. The request includes the priority level, the desired time and duration of service, and the intended travel path through the intersection. This flow also allows the RSE to cancel a previously issued request for priority.

signal service request  (Planned)  Selected Comm Solution

A call for service or extension for a signal control phase that is issued by the RSE for connected vehicles approaching an intersection and/or pedestrians at a crosswalk. This flow identifies the desired phase and service time.

traffic situation data  (Planned)  Selected Comm Solution

Current, aggregate traffic data collected from connected vehicles that can be used to supplement or replace information collected by roadside traffic detectors. It includes raw and/or processed reported vehicle speeds, counts, and other derived measures. Raw and/or filtered vehicle control events may also be included to support incident detection.

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