ATMS14-Advanced Railroad Grade Crossing (Service Package*)
Description
This service package manages highway traffic at highway-rail intersections (HRIs) where operational requirements demand advanced features (e.g., where rail operational speeds are greater than 80 miles per hour). This service package includes all capabilities from the Standard Railroad Grade Crossing service package and augments these with additional safety features to mitigate the risks associated with higher rail speeds. The active warning systems supported by this service package include positive barrier systems that preclude entrance into the intersection when the barriers are activated. Like the Standard package, the HRI equipment is activated on notification by wayside interface equipment which detects, or communicates with the approaching train. In this service package, the wayside equipment provides additional information about the arriving train so that the train's direction of travel, estimated time of arrival, and estimated duration of closure may be derived. This enhanced information may be conveyed to the driver prior to, or in context with, warning system activation. This service package also includes additional detection capabilities that enable it to detect an entrapped or otherwise immobilized vehicle within the HRI and provide an immediate notification to highway and railroad officials.
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 source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here:
TSD
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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Equipment on the Roadway constantly monitors (traffic characteristics) highway-rail intersections. Vehicles may be tracked through the intersection. The equipment may detect when the intersection is blocked. When a blockage is detected, the Traffic Management Subsystem and the Wayside Equipment are notified (intersection blockage notification). Then the Traffic Management Subsystem will notify (hri advisories) the Rail Operations.
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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, when a problem is detected or on a set interval.
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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.
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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. The equipment on the Roadway can receive information on arriving trains (track status and arriving train information) from the Wayside Equipment. This information includes the current status of the tracks and when a train is expected and/or how long the train crossing is expected to last can be displayed for Drivers.
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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.
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Information (driver information) on the current or expected status of the tracks including message signs and flashing crossbucks can be displayed for Drivers. Alternatively, grade crossing status may be communicated to the vehicle using Field-Vehicle Communications (vehicle signage data).
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