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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 Maintenance and Construction Management Subsystem provides current restrictions (current asset restrictions) such as height and weight restrictions to the Traffic Management Subsystem. This information can be sent when new restrictions are put in place or on a set schedule.
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Traffic Operations Personnel can control (traffic operator inputs) the information broadcast to travelers via HAR or other broadcasting equipment. The Traffic Management Subsystem controls (roadway information system data) the equipment on the roadway that broadcast information (broadcast advisories) to Basic Vehicles.
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Traffic Operations Personnel can also control (traffic operator inputs) the information displayed to travelers on dynamic message signs or other equipment along the roadway. The Traffic Management Subsystem controls (roadway information system data) the equipment on the roadway that displays information (driver information) to Drivers.
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Roadway equipment can be coordinated (roadway equipment coordination) through peer-to-peer, master-slave or other configurations. Status of the roadway information equipment (roadway information system status) can be monitored by the Traffic Management Subsystem. The entire process is under the asynchronous monitoring (traffic operator data) of Traffic Operations Personnel.
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Traffic Management Subsystem can share the current and/or expected use of the road network (road network conditions) with an Information Service Provider Subsystem, Transit Management Subsystem, Emergency Management Subsystem and/or the Media. This information can be provided on a set update interval, when conditions change, or on request (request flows not included in the architecture).
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