Knoxville Regional ITS Architecture

Roadway Standard Rail Crossing Functional Area

Description

'Roadway Standard Rail Crossing' manages highway traffic at highway–rail intersections (HRIs) where operational requirements do not dictate advanced features (e.g., where rail operational speeds are less than 80 miles per hour). Either passive (e.g., the crossbuck sign) or active warning systems (e.g., flashing lights and gates) are supported depending on the specific requirements for each intersection. These traditional HRI warning systems may also be augmented with other standard traffic management devices. The warning systems are activated on notification of an approaching train by interfaced wayside equipment. The equipment at the HRI may also be interconnected with adjacent signalized intersections so that local control can be adapted to highway–rail intersection activities. Health monitoring of the HRI equipment and interfaces is performed; detected abnormalities are reported through interfaces to the wayside interface equipment and the Traffic Management Center.

Included In

City of Knoxville Traffic Signals

Functional Requirements

ID	Requirement
01	The field element shall collect and process, traffic sensor data in the vicinity of a highway–rail intersection (HRI).
02	The field element shall monitor the status of the highway–rail intersection (HRI) equipment, including both the current state and mode of operation and the current equipment condition, to be forwarded on to the traffic management center.
03	The field element shall monitor the status of the highway–rail intersection (HRI) equipment, including both the current state and mode of operation and the current equipment condition, to be forwarded on to the rail wayside equipment.
04	The field element shall receive track status from the rail wayside equipment that can be passed on to the traffic management center. This may include the current status of the tracks and whether a train is approaching.
05	The field element shall collect pedestrian images and pedestrian sensor data, and respond to pedestrian crossing requests via display, audio signal, or other manner.
06	The field element shall control the dynamic message signs (DMS) in the vicinity of a highway–rail intersection (HRI) to advise drivers, cyclists, and pedestrians of approaching trains.
07	The field element shall close the highway–rail intersection (HRI) when a train is approaching using gates, lights/signs, barriers, and traffic control signals.
08	The field element shall support the integrated control of adjacent traffic signals to clear an area in advance of an approaching train and to manage traffic around the intersection.
09	The field element shall forward rail traffic advisories received from the Wayside Equipment to the traffic management center.