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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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In order to assess the impact on its operations, the Transit Management Subsystem (TRMS) collects data on the transportation network used by its fleet of demand responsive transit vehicles. This data includes traffic images, current and forecasted traffic information, road and weather conditions, and incident information obtained from the Traffic Management Subsystem (road network conditions and incident information). The data also includes current asset restrictions (e.g., width, height and weight restrictions), roadway maintenance status (e.g., a summary of maintenance activities in the area relevant to the transit fleet), and work zone information (e.g., work zone activities affecting the road network including the nature of the maintenance or construction activity, location, impact to the roadway, expected time(s) and duration of impact, anticipated delays, alternate routes, and suggested speed limits) from the Maintenance and Construction Management Subsystem.
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One of the key functions of the demand responsive transit operations is to dispatch and route its vehicles. The Transit Vehicle Operator can provide an input on the vehicle’s status (transit vehicle operator inputs). This, plus information on availability and passenger usage determined by sensors on-board the vehicle is passed from the Transit Vehicle Subsystem (TRVS) to the TRMS (demand response passenger and use data). This information is provided to the Transit Operations Personnel as part of transit operations status. Transit Operations Personnel can input dispatch, pickup, and routing information as part of transit operations personnel inputs. The information input by the Transit Operations Personnel, or information generated by TRMS software systems is transmitted to the Transit Vehicle Subsystem (TRVS) in transit vehicle operator information. This information is provided to the Transit Vehicle Operator by the flow transit vehicle operator display.
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Another function of the fixed route transit operations is to assign vehicle operators to routes. To initiate this activity, the Transit Vehicle Operator provides their availability to the TRMS (transit vehicle operator availability). This information is passed to the Transit Operations Personnel (transit operations status), who inputs vehicle operator assignments (transit operations personnel inputs). The assignment information is provided to the Transit Vehicle Operator as a route assignment.
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The TRMS manages the demand responsive transit fleet, and its real time knowledge of the fleet status is a valuable source of information for travelers. The TRMS provides the information to the Information Service Provider as transit and fare schedules and transit schedule adherence information.
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In addition the ISP can make, on behalf of its customers, a specific demand responsive transit request to the TRMS, which would respond with a demand responsive transit plan for the customer. If the ISP’s customer chooses to accept this assignment to the demand responsive service, the ISP will respond to the TRMS with an indication of the demand responsive services being contracted for by the ISP’s customer (selected routes).
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