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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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The TRMS provides transit schedule information to the Multimodal Transportation Service Provider for coordination at modal interchange points (transit multimodal information). The Multimodal Transportation Service Provider (who represents the operators of non-roadway transportation systems such as airlines, ferry services, and passenger carrying heavy rail) returns multimodal transportation schedules and service information (multimodal service data).
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TRMS coordinates with the Parking Management Systems (PMS). The TRMS requests static or dynamic parking information (parking lot data request). In response, the PMS sends to the TRMS parking information.
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TRMS coordinates transit service for special events with Event Promoters. Event Promoters send event plans that are used to plan transit service adjustments for the special event and TRMS returns event confirmation acknowledging transit service support for the event.
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Another key coordination function is from one transit agency to another, represented in this market package by the transit service coordination flow that goes both ways between TRMS and Other Transit Management. The coordination between agencies might be on route transfer points and clusters, schedule, on-time information, incident information, and ridership.
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Coordination with a TMS takes the form of a request transit information flow from the TMS to the TRMS, with the response (transit system data) including current transit system operations information indicating current transit routes, the level of service on each route, and the progress of individual vehicles along their routes for use in forecasting demand and estimating current transportation network performance.
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The TRMS collects estimated times of arrival and anticipated schedule deviations from its fleet of transit vehicles (transit vehicle schedule performance) and returns transit schedule information to the transit vehicle to aid in corrective action.
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TRMS will support an interface with Transit Operations Personnel to provide transit operations status and use the transit operations personnel inputs to support the multimodal coordination functionality.
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