When a vehicle with the warning system software on-board approaches a geo-fenced area near a freeway ramp, it sends gps data to the cloud, where the vehicle’s direction of travel is checked.

If the vehicle is found to be going the wrong way, the system is designed to send a warning to the wrong-way driver within seconds, and then also alert other nearby vehicles that have the software or a cell phone on board with an app that uses the software.