1661597 - Moving Towards Ubiquitous Vehicle-to-Everything (V2X) Statewide Transit Priority In Georgia

Abstract: Transit Signal Priority (TSP) systems are used to modify the flow of transit vehicles through intersections. Route timing reliability is a critical metric for transit agencies. Several TSP systems exist, each of which requires close coordination between the transit agency and the infrastructure owner operator. GDOT has been actively deploying V2X equipment at intersections across the state, one goal being integrating them with their signal controllers. This integration not only provides a mechanism to broadcast intersection geometry and signal timing to approaching vehicles, but is being used to support transit signal priority in a common way throughout the state. By leveraging the deployed V2X equipment, no additional hardware needs to be installed at the signal controllers and a secure, standards-based interface between the transit vehicle and signal controller can be deployed consistently statewide.
The system follows IEEE and SAE standards for communications and security. Compliance with published standards promotes scalability across different jurisdictions, restricts access to authorized fleets/vehicles, and allows flexibility in determining when to request and grant priority. Additionally, the use of the V2X system as the backbone enables other applications to be deployed in parallel, including advanced traveler information, green speed recommendation, red light violation warning, and dynamic vehicle probe data, among others.