For the first time on public roads, cellular vehicle-to-everything (C-V2X) technology has been used to request a green light for passenger vehicles, demonstrating how the tech can replace costly intersection detection devices, eliminating wait times at cross streets without disrupting normal traffic flow.
The application was developed by Applied Information for the Texas Department of Transportation (TxDOT) and demonstrated using the TravelSafely smartphone app, an Audi etron Sportback equipped with C-V2X Direct and a cellular network-connected RAM pickup truck using HAAS Alert’s Safety Cloud technology.
The “detector call” application is designed to improve safety by eliminating unnecessary stops at cross streets at night and to reduce the cost of installing and maintaining advanced vehicle detection equipment such as radar, cameras and loops embedded in the pavement.
The application mimics a normal request for a green light from vehicles approaching the traffic signal and changes the light as the vehicle arrives. Eliminating unnecessary stops also reduces idle time which provides an environmental benefit. The application is non-disruptive and maintains the signal’s normal timing routine.
“This is a revolutionary change for the detection system from passive to proactive,” said Steve Chiu, project coordinator, TxDOT Houston. “Also, from a maintenance and efficiency perspective, which is important to the maintaining agency, C-V2X provides a high-level of reliability.”
Bryan Mulligan, president of Applied Information, added, “Enabling passenger vehicles to communicate with traffic signals is a significant leap forward in safety and efficiency. This innovation is available today and can be deployed at scale using existing technology on smartphones, in vehicles, and at traffic signals. Texas DOT is leading the nation in developing and deploying innovative technology to improve safety, save tax dollars and improve the environment.”
The technology enabling passenger vehicles and TravelSafely smartphone app to communicate with the signals and call for the green light using C-V2X was developed by Applied Information. The Audi e-tron was equipped with a C-V2X Direct on-board unit which was programmed to ask for the green light. The pickup truck used its integrated cellular network modem to communicate with HAAS Alert’s Safety Cloud platform, which then delivered the location data to Applied Information’s cloud platform to ask for the green light. The TravelSafely app is available for iPhone and Android smartphones.
