ATMS13-Standard Railroad Grade Crossing (Service Package*)
This service package manages highway traffic at highway-rail intersections (HRIs) where operational requirements do not dictate more advanced features (e.g., where rail operational speeds are less than 80 miles per hour). Both passive (e.g., the crossbuck sign) and active warning systems (e.g., flashing lights and gates) are supported. (Note that passive systems exercise only the single interface between the roadway subsystem and the driver in the architecture definition.) These traditional HRI warning systems may also be augmented with other standard traffic management devices. The warning systems are activated on notification by interfaced wayside equipment of an approaching train. 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 to both highway and railroad officials through wayside interfaces and interfaces to the traffic management subsystem.
Service Package Graphic
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About this Graphic
Includes Equipment Packages and Subsystems:
Includes Architecture Flows:
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Related ITS Applications of ITS Taxonomy
User Services related to this Service Package:
Transaction Set Diagram
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The following discusses how the National ITS Architecture provides the transportation service described by this service package. Each numbered item describes the operation of that portion of the service package identified with the corresponding number on the transaction set diagram.
The status of highway-rail intersection equipment (hri status) including both the current state and mode of operation and the current equipment condition is monitored by the Traffic Management Subsystem. This information can be requested (hri request) by the Traffic Management Subsystem or the Roadway Subsystem can send it when warranted, when a problem is detected or on a set interval. When an equipment problem is identified or anytime conditions require attention, the Traffic Management Subsystem will notify (hri advisories) the Rail Operations.
The Traffic Management Subsystem may use equipment such as signals or gates (hri control data) at highway-rail intersections to control traffic through the intersections. The Roadway equipment sends the status of the equipment including both the current state and mode of operation and the current equipment condition (hri operational status) to the Wayside Equipment. The Wayside Equipment sends notification of an arriving train and the status of the equipment (track status) to the Roadway equipment.
Equipment on the Roadway can be used to constantly monitor (traffic characteristics) highway-rail intersections. Surveillance cameras can be used to view the intersections.
Pedestrians can request right-of-way (crossing call) to cross a highway-rail intersection. Equipment on the roadway notifies the pedestrian when the request has been granted (crossing permission) via display, audio signal or other manner. Information (driver information) on the current or expected status of the tracks including message signs and flashing crossbucks can be displayed for Drivers.