Signal Phase and Timing
A V2X message describing current signal indications and expected timing at a controlled intersection.
Share this
The problem
Why SPaT exists
This section requires approved editorial content.
No substitute explanation has been generated for why Signal Phase and Timing exists.
Operating model
How SPaT works
The approved explanation should connect physical systems, communications, data, security, and operating responsibility.
Signal Phase and Timing messages communicate the state and expected timing of traffic-signal movements. Vehicles and applications combine SPaT with intersection geometry, positioning, and local rules to support red-light warnings, eco-driving, priority, and automated-driving functions. Timing predictions are operational data and may vary in certainty, especially at actuated signals.
Documented activity
Real-world applications
Examples come from verified deployment relationships rather than template-generated use cases.
Application 01
A2/M2 Connected Corridor
A live connected-road corridor in Kent tested vehicle interaction with roadside infrastructure and interoperable cross-border services.
Example: Completed · Corridor
Application 02
Ipswich Connected Vehicle Pilot
Australia's largest C-ITS field operational test connected 355 participant vehicles with 29 roadside stations across Ipswich.
Example: Completed · City
Knowledge database
Explore the ecosystem
Counts are navigation into the records supporting this technology profile.
Technology map
Related technologies
These records share a documented category. Their placement does not imply technical dependency or compatibility.
This section requires approved editorial content.
No substitute explanation has been generated for related technologies.
Evidence and relationships
Supporting database
Structured records connected to this technology through reviewed Directus relationships.
Projects
Deployments
Completed · Corridor
A live connected-road corridor in Kent tested vehicle interaction with roadside infrastructure and interoperable cross-border services.
Completed · City
Australia's largest C-ITS field operational test connected 355 participant vehicles with 29 roadside stations across Ipswich.
Interoperability
Standards
ETSI TS 103 301
ETSI TS 103 301 defines infrastructure-originated C-ITS messages including signal, map, and request/status exchanges. It matters to V2X because it gives independently developed systems a common technical contract.
J2735
Defines message sets and data elements used for dedicated short-range and connected-vehicle communications, including safety and mobility messages.
Institutions
Organizations
standards_development_organization
Standards development organization publishing widely used automotive and V2X message, security, and communications standards.
Geography