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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
4.
Vehicle “B” alerts its driver to a straight crossing path hazard.
5.
Vehicle “B” sends MSG_BasicSafetyMessage[JBK11]
6.
Vehicle “A” receives message.
7.
Vehicle “A” processes the message from Vehicle A and determines that Vehicle B’s
message is relevant (crossing road segment via map and/or heading)
8.
Vehicle “A” alerts its driver to a start-from-stop hazard.
Hardware Devices:
DSRC radio
Positional and vehicle sensors
Human-Machine Interface
Occupant
Vehicle
System
Driver
Passenger
Service
Provider
Road
Department
Actors: (What entities play an
active role in use)
X
X
Support information:
CAMP-VSC Task 3 Report, 2003
Concept of Operations
DSRC communications is used to allow the stopped vehicle to be informed of the presence of other
vehicles in the immediate vicinity. The frequently broadcast MSG_BasicSafetyMessages from vehicles in
the area allow the stopped vehicle to receive the position, velocity, acceleration, and control parameters,
among others, from these vehicles. The in-vehicle unit, based upon the host vehicle’s stopped condition and
combination of release of brake and application of throttle, for example, constructs a predicted travel path
for the host vehicle and also constructs expected travel path for the other detected vehicles by analyzing
their received parameters. If the in-vehicle unit determines that a collision would be likely if the start-from-
stop maneuver is initiated, an appropriate warning is issued to the driver.
Sensors and Other System Needs
On-board sensors to determine the host vehicle’s stopped condition and combination of release of brake
and application of throttle are also needed.
A map database could help to provide information whether crossing path vehicles are in the vicinity of an
intersection. If lane resolution is possible, lane position of the crossing path vehicle can be determined and
used in the algorithm.
Annex C-7 Lane Change Warning
Application Description
This application provides a warning to a vehicle that is about to change lanes. The warning is provided in
order to avoid a collision with vehicles in the intended lane destination of the host vehicle.
Flow of Events
Flow of events