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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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279 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
3.
This activates a PSOBU broadcast of emergency notification warning, current location information,
speed, and direction of travel as well a vehicle type
4.
Vehicle “B”, which may be a standard OBU equipped vehicle or another PSOBU equipped vehicle in
the vicinity, receives the emergency notification message and other data.
5.
Vehicle “B” determines whether Vehicle "A’s" message is relevant (calculates its relative position to
the emergency vehicle and determines if a potential interference may exist). If not, no action is taken;
the vehicles may be moving away from each other, on a different street, etc.
6.
If an imminent interference is detected, an alarm of some type is sent to the driver's HMI. It is assumed
that vehicles will have differing levels of HMI sophistication.
7.
Data updates continue; When the Vehicle "B" path is no longer a potential interference for the PSOBU
equipped vehicle, the warning will terminate.
Vehicle "A"Hardware Devices:
PSOBU
Positional Sensors
Human-Machine Interface
Vehicle
System
Occupant
Service
Provider
Road
Department
Vehicle "A" Actors: (What
entities play an active role in use)
X
X
Vehicle "B" Hardware Devices:
OBU
Positional Sensors
Human-Machine Interface
Occupant
Vehicle
System
Driver
Passenger
Service
Provider
Road
Department
Vehicle "B" Actors: (What
entities play an active role in use)
X
X
Support information:
CAMP-VSC Task 3 Report, 2003
4. System Architecture and Concept of Operation
A PSOBU vehicle is put into emergency service. Upon being put into emergency service, emergency
messages begin being sent to surrounding vehicles and signal request messages are emitted as the vehicle
travels. The Emergency Vehicle Approaching Warning message includes: Location, Direction, Speed,
Type of vehicle, Type of response, Siren in use, Light bar in use, and Multiple [RS46]vehicles responding
(optional). See GG note about need for destination here, unresolved issue The signal request message
contains the requested priority or preemption value to be requested of each ASC, and some vehicle
identification number (nominally a fleet number or VIN number). Any signal state messages recovered
(from ASCs that are processing to this or another request) will contain the current active request and data
regarding which vehicle asked for it, as well as a sequence of other pending requests from other vehicles.
Private vehicles in the area may use the Emergency Vehicle Approaching data to analyze if they may
encounter the responding vehicle. If this is possible, applicable information may be communicated to the