AVSS03-Longitudinal Safety Warning (Service Package*)
This service package allows for longitudinal warning. It utilizes safety sensors and collision sensors. It requires on-board sensors to monitor the areas in front of and behind the vehicle and present warnings to the driver about potential hazards.
Service Package Graphic
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About this Graphic
Includes Equipment Packages and Subsystems:
Includes Architecture Flows:
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Related ITS Applications of ITS Taxonomy
User Services related to this Service Package:
Transaction Set Diagram
The source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here:
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.
The vehicle receives input from the Driver (e.g. throttle and brake) (driver inputs). Data is also collected from sensors on the vehicle (basic vehicle measures) associated with basic vehicle systems (e.g. traction control, anti-lock brakes, speedometer, accelerometer, and basic engine measurements) and sensors detect objects that may be in front of or behind the vehicle (physical presence) as well as sensing the roadway environment (roadway characteristics). 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 (driver updates).
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. A position fix provides vehicle location and current accurate map data is provided to the vehicle (map update request and map updates).