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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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160 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
ANNEX A-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
1.
Overtaking Vehicle “A” sends MSG_BasicSafetyMessageFrame, Part I.
2.
Lane-changing Vehicle “B” receives message
3.
Vehicle “B” recognizes that Vehicle A’s message is relevant (by location in adjacent lane,
proximity or rate of overtaking)
4.
Vehicle “B” alerts its driver to a potential overtaking vehicle hazard.
Hardware Devices:
DSRC radio
Positional 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
As with the other vehicle safety application scenarios in this annex, DSRC communications is used to allow the
host vehicle to detect all equipped vehicles in the immediate vicinity. As well, the lane-changing vehicle receives
the position, velocity, acceleration, and control parameters, among others, for all these vehicles through their
MSG_BasicSafetyMessageFrame, Part I messages. The in-vehicle unit, based upon the host vehicle’s turn signal
initiation and/or possibly other control parameters like steering wheel movements, constructs a potential vector for
the host vehicle and analyzes the received parameters to construct expected future vectors for other vehicles in the
immediate vicinity. If the in-vehicle unit determines that a collision would be likely if the indicated lane change
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 intent to change lanes, e.g., turn signal or other control
parameters, will also be needed.
A map database, if available, could help to provide information about whether vehicles are in adjacent lanes. In
addition, the road curvature can be taken into account when an application host vehicle evaluates the presence of
an approaching or existing vehicle in the adjacent lane.