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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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103 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Used By: This entry is used directly by one other data structure in this standard, a DF called
DF_VehicleStatus <ASN> <XML>. In addition, this item may be used by data structures in other ITS
standards.
7.10 Data Element: DE_BrakeAppliedStatus
Use: A bit string enumerating the status of various brake systems (different wheels) of the vehicle. Brake
applied status indicates when vehicle braking has occurred. This may be used by traffic management
centers to determine that an incident or congestion may be present. It is possible for some vehicles to
provide an indication of how hard the braking action is but at this time only an indication that braking has
occurred is used.
ASN.1 Representation:
BrakeAppliedStatus ::= BIT STRING {
allOff (0), -- B'0000 The condition All Off
leftFront (1), -- B'0001 Left Front Active
leftRear (2), -- B'0010 Left Rear Active
rightFront (4), -- B'0100 Right Front Active
rightRear (8), -- B'1000 Right Rear Active
allOn (15) -- B'1111 The condition All On
} -- to fit in 4 bits
XML Representation:
<xs:simpleType name="BrakeAppliedStatus-item" >
<xs:annotation>
<xs:appinfo>
allOff (0) -- B'0000 The condition All Off
leftFront (1) -- B'0001 Left Front Active
leftRear (2) -- B'0010 Left Rear Active
rightFront (4) -- B'0100 Right Front Active
rightRear (8) -- B'1000 Right Rear Active
allOn (15) -- B'1111 The condition All On
</xs:appinfo>
<xs:documentation>
to fit in 4 bits
</xs:documentation>
</xs:annotation>
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:int">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="15"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="allOff"/>
<xs:enumeration value="leftFront"/>
<xs:enumeration value="leftRear"/>
<xs:enumeration value="rightFront"/>
<xs:enumeration value="rightRear"/>
<xs:enumeration value="allOn"/>
</xs:restriction>
</xs:simpleType >
</xs:union>
</xs:simpleType>
<xs:simpleType name="BrakeAppliedStatus">
<xs:list itemType="BrakeAppliedStatus-item"/>
</xs:simpleType>
In addition, this item may be used by data structures in other ITS standards.
Remarks: Current thinking of the committee members to deal with issue of trailer and long-axle style
vehicle is to have another message which can be used in these cases and which would convey the overall
length and style of the vehicle and trailer involved.