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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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191 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Annex A-6 Stop Sign Movement Assistance
Application Description
This application provides a warning to a vehicle that is about to cross through an intersection after having
stopped at a stop sign. This may prevent collisions with traffic approaching the intersection. In particular,
this application warns drivers when a collision is probable if the indicated start-from-stop is initiated.
Flow of Events
Flow of events
1.
Vehicle “A”, starting from stop, sends MSG_BasicSafetyMessageFrame, Part
I
2.
Vehicle “B” receives message
3.
Vehicle “B” recognizes that Vehicle A’s message is relevant and, per the
message information (e.g. location, speed, heading, acceleration, throttle
position, etc.), that trajectories of Vehicles “A” and “B” will likely intersect.
4.
Vehicle “B” alerts its driver to a straight crossing path hazard.
5.
Vehicle “B” sends MSG_BasicSafetyMessageFrame, Part I
5.
Vehicle “A” receives message.
6.
Vehicle “A” recognizes that Vehicle B’s message is relevant (crossing road
segment via map and/or heading)
7.
Vehicle “A” alerts its driver to a start-from-stop 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
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_BasicSafetyMessageFrame, Part I and
MSG_BasicSafetyMessageFrame, Part II messages 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 potential vector for the host vehicle and also constructs