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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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305 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
TimeToChange = 12.3 seconds
YellowSignalState =
State #2
Lane Set
(list of lanes this applies to)
3,4.5.6, etc...
Movement State(signal state or pedestrian state)
SignalState = Red light
TimeToChange = Indeterminate for this state
YellowSignalState =
Preempt = none present
The SPAT message consists of a sequence of “states” for each lane-approach. The SPAT status
information is connected the lanes found in the MAP message by the use of shared lane numbering values.
The overall framework consists of the regionally unique intersection ID (required), the collation of current
lane states, any signal-wide preemption data, and some optional content (such as the human readable name
of the intersection) as follows:
Up to 255 unique states can be sent, although more commonly only active states are sent at any time (the
phase of the active lane-approach, and all other lanes which are in a red-phase). Considering the state data
frame further we see that it includes...