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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 entire process is under the asynchronous monitoring (traffic operator data) and control (traffic operator inputs) of Traffic Operations Personnel. Equipment on the Roadway is constantly monitoring traffic conditions (traffic characteristics) including volume, speed, density, etc.
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To obtain information about traffic on freeways, the Traffic Management Subsystem can control (traffic sensor control) and monitor (traffic flow) sensors in or along the roadway.
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The Traffic Management Subsystem may obtain information on traffic (traffic images) on freeways from video equipment. The equipment can be controlled e.g. pan/tilt/zoom (video surveillance control) by the Traffic Management Subsystem.
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Traffic Operations Personnel can also control the information displayed to travelers on dynamic message signs or other equipment along the roadway. The Traffic Management Subsystem sends informtion to the dynamic message signs or other equipment(roadway information system data). Tthe equipment on the roadway displays the information (driver information) to Drivers. The status of the equipment ( roadway information system status) is returned to the Traffic Management Subsystem.
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Traffic Management Subsystem can configure, download timings and otherwise control (freeway control data) equipment along a freeway to control traffic. Traffic Management Subsystem can monitor the status of the equipment (freeway control status). Roadway equipment can be coordinated (roadway equipment coordination) through peer-to-peer, master-slave or other configurations. Additionally, the roadway equipment provides traffic control indications (driver information) to the driver while en-route.
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