Intersection Signal Controllers and Vehicle-Infrastructure Integration: Putting Safe Intersections to Practice

Roadside equipment using prototype 5.9 GHz Dedicated Short Range Communication radios to communicate traffic signal controller and other information to vehicles has been installed as part of the Vehicle-Infrastructure Integration California (VII California) testbed. This paper begins with a review of the motivation in developing this type of signal-to-vehicle communication by generally discussing the concept and research behind dynamic red light countermeasures through current concepts in using VII as an enabler for intersection safety. The VII California testbed and the sites of these systems that interact with legacy and more modern controllers are described. Next, issues and lessons learned from the experience of integrating radio communication with traffic signal controllers in the field are discussed. A summary and design and implementation issues for the future of intersection safety are finally described.