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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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On an asynchronous basis, the Maintenance and Construction Management Subsystem (MCMS) controls work zone warning devices that are at the Roadway (work zone warning device control), and will monitor both these devices (work zone warning status) and similar warning devices that are placed on Maintenance and Construction Vehicle Subsystems (work zone warning status).
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A work zone intrusion detection and alert device located at the Roadway might have the following operation. Traffic characteristics and crew movements of the Maintenance and Construction Field Personnel are monitored by the device. When an intrusion is detected, a general work zone warning is given to the Maintenance and Construction Vehicle Subsystem, MCVS (work zone warning notification) or to the Maintenance and Construction Field Personnel directly (work zone warning). An alternative mode of operation would be that warnings are provided based on knowledge of the crew’s movements, rather than a general area warning. It is also possible that the intrusion detection device is separate from the alerting device, with data passing across the Roadway Subsystem to Other RS interface (roadway equipment coordination). Once an intrusion is detected an alert to the driver of the intruding vehicle is provided via a roadside information display (driver information) or via an in-vehicle signage display (vehicle signage data).
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A work zone intrusion warning and alert device located on an MCVS would have a similar operation as that described above. Traffic characteristics and crew movements of the Maintenance and Construction Field Personnel are monitored by the device. When an intrusion is detected, a general work zone warning is given to the Maintenance and Construction Field Personnel directly. An alternative mode of operation would be that warnings are provided based on knowledge of the crew’s movements, rather than a general area warning. It is also possible that a work zone warning notification could be sent to another maintenance and construction vehicle (the Other MCV entity). Once an intrusion is detected an alert to the driver of the intruding vehicle could be provided via a roadside information display (driver information) or via an in-vehicle signage display (vehicle signage data).
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To support the first two sequences described above, the Maintenance and Construction Center Personnel can provide the device control information (maint and constr center personnel inputs) and can get an indication of work zone intrusions that have occurred and what alerts were provided (maint and constr operations information presentation).
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