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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.
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The Rail Operations system sends train schedules, maintenance schedules, and other information that supports forecast of highway-rail intersection closures (railroad schedules) to the Traffic Management Subsystem. The Rail Operations also notifies the Traffic Management Subsystem of railway-related incidents or other advisories (railroad advisories).
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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 will control equipment (hri control data) at highway-rail intersections. The Traffic Management Subsystem may use surveillance cameras to monitor the intersections, gates or signals to control traffic through the intersections or signs or signals to display information on train crossings to travelers. Further functions are provided by ATMS13, Standard Railroad Grade Crossing, and ATMS14, Advanced Railroad Grade Crossing.
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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. The status can be requested (hri request) by the Traffic Management Subsystem or the Roadway Subsystem can send it when warranted, either when a problem is detected or on a set interval.
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The Traffic Management Subsystem can share the current and/or expected status of highway-rail intersections (road network conditions) with an Information Service Provider.
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