Abstract: A system for providing a warning when at least two vehicles, first and second vehicles, are near a common collision point. The system includes closed loop verification between a first vehicle and a common collision point. The system includes a first transmitter for transmitting a first radio frequency signal, a first receiver for receiving the first radio frequency signal at the common collision point, a second transmitter for transmitting a second radio frequency signal from the common collision point to the first vehicle and to any approaching vehicles, a second receiver in a vehicle which can receive the second radio frequency signal and indicate that the first and second vehicles are near a common collision point, and a third receiver in the first vehicle for receiving the second radio frequency signal and for providing an indication that a closed loop between the first vehicle and the common collision point is functioning properly.