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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.
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Data collected and sent to the Traffic Management Subsystem can be associated with links and nodes of the transportation network. Map updates from a Map Update Provider keep this model of the transportation network current, and are available upon request by the Traffic Management Subsystem (map update request).
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Traffic characteristics represent the conditions sensed by the field equipment. Field sensor parameters can be initialized by the Traffic Management Subsystem, and configured field sensors can send data (traffic flow) back to the Traffic Management Subsystems. The traffic sensor control message can be optional; in that sensors may be hard-configured in the field, or the message can be a subscription relationship to traffic flow (i.e. one traffic sensor control message may result in a continuous stream of traffic flow information as per the traffic sensor control message until the next traffic sensor control message). In addition, the (traffic sensor control) message can control the sharing of information directly between field equipment deployments (roadway equipment coordination).
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Similarly, the Traffic Management Subsystem can control video equipment (video surveillance control) (e.g. pan/tilt/zoom) and receive traffic images in return.
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All (or selected) collected (road network conditions) can be shared with Information Service Providers.
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