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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 entity Location Data Source sends the flow position fix to the Transit Vehicle Subsystem (TRVS). The location information is passed along to the Transit Management Subsystem (TRMS) via the architecture flow transit vehicle location data. This architecture flow also contains automated vehicle mileage and fuel usage reporting, which are collected in the TRVS through the flow transit vehicle measures from the Basic Transit Vehicle. Finally, the estimated times of arrival and anticipated schedule deviations are sent from the TRVS to the TRMS in the flow transit vehicle schedule performance.
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As part of vehicle tracking the TRMS will convert the location data received from the TRVS into some map-based representation. An interface to a Map Update Provider is available to keep this map-based representation of the transportation network current. The implied operation of this interface is for the TRMS to request a map update (map update request), and the Map Update Provider to electronically provide the update (map updates).
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Information about transit vehicle location and schedule adherence is provided as part of the flow transit schedule adherence information. This information may be requested by the ISP or provided periodically or as needed by the TRMS.
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It is also possible to use the location and tracking services on equipped transit vehicles equipped as probes. The Transit Management Subsystem can provide the Traffic Management Subsystem and/or an Information Service Provider with information on probe vehicles (transit probe data).
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