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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 Vehicle subsystem (VS) monitors the driver inputs from the Driver, e.g. throttle and brake systems. Data is also collected from sensors on the vehicle associated with basic vehicle systems, e.g. traction control, anti-lock brakes, speedometer, accelerometer, and basic engine measurements (basic vehicle measures). Sensors that are part of the on-board equipment may also be collecting data regarding objects that may be close to the vehicle. The VS includes sensors to collect data about the roadway itself including the lane positioning of the vehicle within the roadway (roadway characteristics).
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An Emergency Vehicle Subsystem (EVS) may transmit an emergency vehicle alert to surrounding vehicles which will be received by VS and used as part of its analysis to determine if a collision is imminent. Current vehicle location is also determined (position fix) and used in the analysis.
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The VS will exchange vehicle safety data with other equipped vehicles within the range of the Vehicle-Vehicle Communications. With all of the data received VS will determine probability of a collision and deterimine the need to deploy any safety systems. The VS presents updates and alarms to the Driver (driver updates) regarding potential collisions with objects, people or vehicles ahead of or behind the vehicle, including emergency vehicles in the area.
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The VS may also send the same vehicle safety data to Roadway equipment that looks at all data provided by vehicles in the proximity and identifies potential hazardous situations. In addition, data is gathered from other Roadway sensors (roadway equipment coordination) that detect road condtions, unequipped vehicles, and other objects on the road. From all of the data received, the Roadway identifies hazardous situations and sends warning(s) to vehicle(s) (roadway safety data). The Traffic Management Subsystem monitors (short range communications status) and controls (vehicle signage data) the Roadway equipment.
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