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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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81 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
data elements for technology type and for accuracy are typically not used and are provided for the rare
occasions when they may be needed.
6.43 Data Frame: DF_SpecialLane
Use: A SpecialLane data structure provides lane number, lane width and lane attributes within an approach
structure for special types of lanes including lanes for use by trains (tracked vehicles) and transit vehicles.
The SpecialLaneAttributes data element denotes what generally type of lane it is. The nodeList data
element provide a detailed set of offset values to map the path of the lane. The keepOutList (which is
optional) denotes any segments along the path where users of the path can not safely stop.
ASN.1 Representation:
SpecialLane ::= SEQUENCE {
laneNumber LaneNumber,
laneWidth LaneWidth OPTIONAL,
laneAttributes SpecialLaneAttributes,
nodeList NodeList,
-- path details of the lane and width
keepOutList NodeList OPTIONAL,
-- no stop points along the path
...
}
XML Representation:
<xs:complexType name="SpecialLane" >
<xs:sequence>
<xs:element name="laneNumber" type="LaneNumber" />
<xs:element name="laneWidth" type="LaneWidth" minOccurs="0"/>
<xs:element name="laneAttributes" type="SpecialLaneAttributes" />
<xs:element name="nodeList" type="NodeList" />
<!-- path details of the lane and width -->
<xs:element name="keepOutList" type="NodeList" minOccurs="0"/>
<!-- no stop points along the path -->
</xs:sequence>
</xs:complexType>
Used By: This entry is used directly by one other data structure in this standard, a DF called
DF_Approach <ASN> <XML>. In addition, this item may be used by data structures in other ITS
standards.
6.44 Data Frame: DF_SpeedandHeadingConfidence
Use: A single byte long data frame combining multiple related bit fields into one byte.
ASN.1 Representation:
SpeedandHeadingConfidence ::= SEQUENCE {
heading HeadingConfidence, -- 3 bits
speed SpeedConfidence, -- 3 bits
throttle ThrottleConfidence -- 2 bits
}
XML Representation:
<xs:complexType name="SpeedandHeadingConfidence" >
<xs:sequence>
<xs:element name="heading" type="HeadingConfidence" />
<!-- 3 bits -->
<xs:element name="speed" type="SpeedConfidence" />
<!-- 3 bits -->
<xs:element name="throttle" type="ThrottleConfidence" />
<!-- 2 bits -->
</xs:sequence>
</xs:complexType>