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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Each request value (pValue) is associated here with a set of data (data) that outlines either the lanes it
covers (laneSet) or a set of zones (zones) made up of either encloses lanes (LaneSet) or a nodeList forming
a polygon of coverage. Public safety vehicles use this data to determine which request to make, then use
that value in the Signal Request Message (SRM) to request a preempt or priority from the intersection
controller. The changed state of the controller (if any) is reflected in both the SPAT message and the
Signal Status Message (SSM) message.
4. Additional details of message use
The use of this message set to correctly describe intersections and then model them with the SPAT will
involve a considerable number of additional details. At the time the current standard went to ballot, this
detail had not been created, but is expected to be placed into a subsequent users guide document along with
working examples.