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SAE J2735-Draft-Rev26 [issued: 09-18-08] 
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
         a preempt or a priority value. -->
         <xs:element name="requestedActon" type="SignalReqScheme"  minOccurs="0"/>
         <!-- preempt ID or the
         priority ID
         (and strategy) -->
         <xs:element name="inLane" type="LaneNumber"  minOccurs="0"/>
         <!-- approach Lane -->
         <xs:element name="outLane" type="LaneNumber"  minOccurs="0"/>
         <!-- egress Lane -->
         <xs:element name="type" type="NTCIPVehicleclass" />
         <!-- Two 4 bit nibbles as:
         NTCIP vehicle class type
         NTCIP vehicle class level
         any validation string used by the system -->
         <xs:element name="codeWord" type="CodeWord"  minOccurs="0"/>
      </xs:sequence>
</xs:complexType>
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):
MSG
<ASN> <XML>, and
MSG
In addition, this item may be used by data structures in other ITS standards.
6.41 Data Frame: DF_SnapshotDistance
Use: To allow Network Users to change the snapshot collection policy based on speed and distance.  Two
distances and two speeds are included in this Data Frame D1, S1 and D2, S2 to be used by the OBE as
follows:
If speed is
= S1 then distance to next snapshot is D1
If speed is
= S2 then distance to next snapshot is D2
If speed is > S1 and < S2 then distance to snapshot is linearly interpolated between D1 and D2
If S1 is set to zero then the distance to the next snapshot is always D1. 
ASN.1 Representation:
SnapshotDistance ::= SEQUENCE {
   d1   INTEGER(0..999),   -- meters
   s1   INTEGER(0..50),    -- meters\second
   d2   INTEGER(0..999),   -- meters
   s2   INTEGER(0..50)     -- meters\second
   }
XML Representation:
<xs:complexType name="SnapshotDistance" >
      <xs:sequence>
         <xs:element name="d1" >
            <xs:simpleType>
               <xs:restriction base="xs:unsignedShort">
                  <xs:maxInclusive value="999"/>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
         <!-- meters -->
         <xs:element name="s1" >
            <xs:simpleType>
               <xs:restriction base="xs:unsignedByte">
                  <xs:maxInclusive value="50"/>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
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