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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 driver can activate the system and provide steering and other vehicle control inputs to the vehicle (driver inputs).
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Accurate positioning of the vehicle on the road network can also be used to improve performance of the vehicle safety system. Accurate position combined with detailed map data provides information about the road geometry ahead of the vehicle which can be used to adjust alarm thresholds and reduce false alarms. Aposition fix provides vehicle location and current accurate map data is provided to the vehicle (map update request and map updates).
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Vehicle performance and the driver's current control of the vehicle are monitored including basic vehicle measures such as vehicle speed, acceleration, anti-lock brake status, traction control status, acceleration, and turning movement. Sensors detect objects that may be in front of or behind the vehicle (physical presence). The Vehicle subsystem analyzes this data and presents updates and alarms to the Driver regarding potential collision with objects, people or vehicles ahead of or behind the vehicle. If a collision or a safety violation is imminent, the vehicle may take evasive action (e.g. change in throttle position, change in transmission gearing, braking - vehicle control).
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Driver updates provide information about the operational status of the safety system and a positive indication of any hazardous conditions and automated system activations.
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