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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.
Note that this transaction set diagram (TSD) is only 1 of the 2 TSDs and so only a portion of the numbered items below refer to the above TSD.
ATMS11 transaction set diagrams:
1
2
Next TSD
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The Emissions Management Subsystem (EMMS) collects air quality information using distributed sensors. Environmental pollutant levels are monitored using sensors that provide area pollution data back to the EMMS. The EMMS controls the air quality sensors (pollution sensor control).
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The Emissions Management Subsystem (EMMS) also monitors emissions of passing vehicles. Passing vehicles may support this monitoring by collecting basic vehicle measures and providing vehicle diagnostics data that includes drive train performance and collected emissions data to the Roadway using Field-Vehicle Communications. The EMMS provides the current criteria of acceptable emission levels and control parameters (emissions sensor control) to the monitoring equipment on the Roadway. The equipment receives and/or measures emissions of passing vehicles and identifies vehicles (vehicle characteristics) that meet or exceed the acceptable standards. Vehicle emissions data is sent from the Roadway to the Emissions Management Subsystem.
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There are several ways to handle vehicles that exceed acceptable emissions levels. First, roadway equipment can be coordinated (roadway equipment coordination) to allow the emission equipment to cause a prescribed message to appear on a roadway information device (e.g., DMS) to notify the offending driver (driver information). This equipment coordination can be peer-to-peer, master-slave, or in other configurations. Second, Field-Vehicle Communications can be used to communicate emissions information to vehicles (vehicle signage data) which then present the information to their drivers (driver updates).
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Alternatively, emissions violations detected by the Emissions Management Subsystem may be sent to the DMV (license request) to determine the registered owner of the vehicle (registration). Violations (emissions violation notification) are reported to an Enforcement Agency.
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The Emissions Management Operator can request pollution data compliance levels for a specific region (pollution data parameters) from the Emissions Management Subsystem. The Emissions Management Subsystem responds with reference and/or current pollution status details (pollution data display) for the specified area.
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The Emissions Management Subsystem analyzes the results of the collected area pollution data, factors in the weather information provided by the Weather Service, and may choose to display the information on a map of the transportation network. To keep the base map up to date, map updates can be acquired from a Map Update Provider upon request (map update request), on a set schedule, or as revisions warrant it.
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Area-specific pollution information may be provided to the Traffic Management Subsystem (widearea statistical pollution information) upon request (pollution state data request). This information may be used by the TMS to assist in the implementation of environmentally sensitive Travel Demand Management (TDM) programs, policies, and regulations.
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Area-specific pollution information (air quality information) may also be provided to the Information Service Provider and the Media for dissemination to travelers.
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