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U.S. Department of Transportation
Signal Phase and Timing (SPaT)
Goal: Develop an
interface between signal controllers and RSE to enable
2-way data exchange between vehicles and controllers
§SPaT Data
□Signal
state by movement
□Min/max time
remaining by movement
□Exact
time remaining in yellow
§Geometric intersection description
(GID)
(GID)
§Signal request messages (Emergency
vehicle preemption, transit signal
priority, etc.)
vehicle preemption, transit signal
priority, etc.)
§RTCP position correction message
§Standards to promote
interoperability
□NTCIP
1202 and 1211
□SAE
J2735
