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SAE J2735-Draft-Rev29 [issued: 12-11-08] 
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199 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
XML Representation:
<xs:simpleType name="VehicleMass" >
      <xs:annotation>
         <xs:documentation>       
            mass with an LSB of 50 Kg
         </xs:documentation>
      </xs:annotation>
      <xs:restriction base="xs:unsignedByte">
         <xs:minInclusive value="1"/>
         <xs:maxInclusive value="127"/>
      </xs:restriction>
</xs:simpleType>
Used By: This entry is directly used by the following 2 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
DF 
<XML>, and
MSG
In addition, this item may be used by data structures in other ITS standards.
Remarks: [Note: There is debate in the Traffic Info group to change the value range used here to allow up
to 40 tons.  The normal privacy and tracking concerns apply. ]
7.146 Data Element: DE_VehicleRequestStatus
Use: The VehicleRequestStatus data element is used to relate status information about a vehicle when
requesting service from a signalized intersection.  It relates some basic information about the requester
which can be used by the signal systems in its response with changes to the timing plan in use.   Note that
this status is used in both priority and preemption use cases but that the information mapped into the lower
4 bits varies with each.  
ASN.1 Representation:
VehicleRequestStatus ::= OCTET STRING (SIZE(1)) 
  -- With bits set as follows: 
  -- Bit 7 (MSB)  Brakes-on, see notes for use 
  -- Bit 6 Emergency Use or operation 
  -- Bit 5 Lights in use (see also the light bar element)
  -- Bits 5~0
  -- when a priority, map the values of 
  -- LightbarInUse to the lower 4 bits 
  -- and set the 5th bit to zero
  -- when a preemption, map the values of 
  -- TransistStatus to the lower 5 bits
XML Representation:
<xs:complexType name="VehicleRequestStatus" >
   <xs:simpleContent>
      <xs:annotation>
         <xs:documentation>       
            With bits set as follows:
            Bit 7  (MSB)   Brakes-on,  see notes for use
            Bit 6 Emergency Use or operation
            Bit 5 Lights in use  (see also the light bar element)
            Bits 5~0
            when a priority,  map the values of
            LightbarInUse to the lower 4 bits
            and set the 5th bit to zero
            when a preemption,  map the values of
            TransistStatus to the lower 5 bits
         </xs:documentation>
      </xs:annotation>
      <xs:extension base="VehicleRequestStatus-string" >
         <xs:attribute name="EncodingType" use="required">
           <xs:simpleType>