US Patent 7518531 Traffic control device transmitter, receiver, relay and display system

A traffic control device information display system, including (a) a receiver that receives first information about a traffic control device, (b) a relay that transmits second information to a processor responsive to the first information, (c) the processor, wherein the processor processes the second information to determine identification information for the traffic control device and to determine if the traffic control device has been improperly moved or knocked down, and (d) a display that displays the identification information to an operator and that indicates if the traffic control device has been improperly moved or knocked down.