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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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To obtain information about traffic, the Traffic Management Subsystem can control (traffic sensor control) and asynchronously monitors the volume, speed and other parameters indicating the flow of vehicles (traffic flow) along the roadway. The Traffic Management Subsystem can configure, download timings and otherwise control (freeway control data) equipment along a freeway to control traffic. Alternatively, control equipment may receive control inputs directly from sensor equipment along the roadway (roadway equipment coordination) through peer-to-peer, master-slave or other configurations. Traffic Management Subsystem can monitor the status of the control equipment (freeway control status).
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Sensors in the Roadway Subsystem monitor passing vehicles to measure vehicle occupancy (vehicle characteristics).
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Alternatively, the Vehicle Subsystem may count occupants and monitor their positioning within the vehicle to enhance vehicle safety (basic vehicle measures). The collected vehicle occupancy information may also be sent to the Roadway Subsystem using Field-Vehicle Communications. Vehicle occupancy that is measured by the vehicle is also available to the driver (driver updates).
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The Traffic Management Subsystem monitors the flow of traffic and/or vehicle occupancies in HOV lanes (hov data). When a violation in the use of an HOV lane is detected, the Traffic Management Subsystem may contact the DMV (license request) to determine the registered owner of vehicle (registration). Violations (traffic violation notification) are reported to an Enforcement Agency.
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