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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 monitor (traffic flow) sensors in or along the Roadway. Traffic Management Subsystems can share information on traffic conditions (traffic information coordination) so traffic operations can be coordinated.
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Traffic Management Subsystems can share (traffic control coordination) monitoring (freeway control status) and/or control (freeway control data) of equipment on freeways. Shared monitoring might allow video images from surveillance cameras to be viewed. Shared control might allow surveillance cameras to be panned, tilted or zoomed or ramp meter control where the metering plan is selected based on the timing scheme of the surface street feeding the ramp.
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Traffic Management Subsystems share (traffic control coordination) monitoring (signal control status) and/or control (signal control data) of equipment on surface streets. Shared monitoring might include monitoring of traffic signal systems. Shared control might include surveillance cameras that can be panned, tilted or zoomed or selection of traffic signal timing plans during evening hours when a center is not staffed.
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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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