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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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128 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
-- First two bit (MSB set to zero.
-- Combining these 3 items in the remaning 6 bits
-- sirenUse SirenInUse
-- lightsUse LightbarInUse
-- multi MultiVehicleReponse
XML Representation:
<xs:simpleType name="EmergencyDetails" >
<xs:annotation>
<xs:documentation>
First two bit (MSB set to zero.
Combining these 3 items in the remaning 6 bits
sirenUse SirenInUse
lightsUse LightbarInUse
multi MultiVehicleReponse
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedByte">
<xs:maxInclusive value="63"/>
</xs:restriction>
</xs:simpleType>
Used By: This entry is used directly by one other data structure in this standard, a MSG called
MSG_EmergencyVehicleAlert <ASN> <XML>. In addition, this item may be used by data structures
in other ITS standards.
7.46 Data Element: DE_EventFlags
Use: The DE_EventFlags data element is used to denote when various events have been detected in the
sending vehicle. The presence of this value (i.e. the presence and any bits sets to ones) indicates that some
unusual event has either been detected or predicted in the sending vehicles. Other vehicles receiving this
information may wish to process the message in which it is found in differing ways to detect potential
safety or hazard issues. When an event flag is present in a message, other optional data elements may also
be present. Consult the each specific application for further details and rules.
Further normative definitions of when the assert each event are given below.
Handbrake Active: Any auxiliary braking system is active for more than 400mSec.
Hood Open: The engine compartment hood is not closed (may indicate breakdown event).
Air Bag Deployment: At least one airbag has been deployed .
Hazard Lights: The hazard lights are active.
Stop Line Violation: The vehicle anticipates it will pass the line with coming to a full stop before
reaching it.
Hazardous Materials The vehicle known to be carrying hazardous material and is placarded as such.
Emergency Response: The vehicle is a properly authorized public safety vehicle type and is engaged in
a service call at this time where accelerated driving is present (lights and sirens may not be evident).
Hard Breaking: The vehicle has (or is) decelerated at a rate of greater then 0.3g for a period exceeding
250 mSec.
Other Breaking: The vehicle has decelerated with an active breaking system. One or more of the
following are active: brake boost, traction control, or ant-lock braking.
Lights Changed: The status of the external lighting of the vehicle has changed recently (the new state of
the lights is presented in another element).
Wipers Changed: The status of wipers (font or rear) of the vehicle has changed recently (the new state
of the wipers is presented in another element).