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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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41 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
the current prempt -->
<xs:element name="localSPAT" type="local:SPAT" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
In addition, this item may be used by data structures in other ITS standards.
Remarks: Note: There is no reason this message could not nest multiple intersections worth of data at
once, may ask membership if they want any such nesting (would save a few bytes), Ed.
5.15 Data Frame: MSG_TravelerInformation
Use: The Traveler Information message is used to send various types of messages (advisory and road sign
types) over the WSM stack to vehicles. It makes heavy use of the ITIS encoding system to send well
known phrases, but allows limited text for local place names. The supported message types specify several
sub-dialects of ITIS phrase patterns to further reduce the number of bytes to be sent. The expressed
messages are active at a precise start and duration period, which can be specified to a resolution of a
minute. The affected local area can be expressed using either a radius system or a system of short defined
regions which is similar to the way roadway geometry is defined in the map fragment messages.
ASN.1 Representation:
TravelerInformation ::= SEQUENCE {
msgID DSRCmsgID, -- some unique value here
packetID UniqueMSGID, -- (octect 9 bytes)?
-- is not this handled in the msg header?
dataFrameCount INTEGER(1..32) OPTIONAL,
-- is not needed
dataFrames SEQUENCE (SIZE(1..8)) OF SEQUENCE {
-- Part I, Frame header
frameType TravelerInfoType, -- (enum, advisory or road sign)
msgId CHOICE {
advisoryNumber ATISAdvisoryNumber, -- 2 bytes?
-- perhaps issurs and number?
-- links to ATIS msgs
roadSignID RoadSignID
-- to be defined as a DF
},
startYear DYear OPTIONAL,
-- Current year used if missing
startTime MinuteOfTheYear,
duratonTime MinutesDuration,
priority SignPrority,
-- Part II, Appliciable Regions of Use
regions SEQUENCE (SIZE(1..8)) OF ValidRegion,
-- Part III, Content
content CHOICE {
advisory ITIS.ITIScodesAndText,
-- typical ITIS warnings
workZone WorkZone,
-- work zone signs and directions
genericSign GenericSignage,
-- MUTCD signs and directions
speedLimit SpeedLimit,
-- speed limits and cautions
exitService ExitService
-- roadside avaiable services
-- other types may be added in future revisions
}, --# UNTAGGED
},
... -- # LOCAL_CONTENT
}
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