Traffic light control

Claim 1

APPARATUS FOR CONTROLLING SIGNAL DEVICES PROVIDED AT A PLURALITY OF LOCAL STATIONS FROM A CENTRAL STATION INCLUDING IN COMBINATION, A RADIO TRANSMITTER AT THE CENTRAL STATION, A PLURALITY OF RADIO RECEIVERS ASSOCIATED WITH THE LOCAL STATIONS, MEANS ASSOCIATED WITH SAID TRANSMITTER FOR SIMULTANEOUSLY APPLYING THERETO SYNCHRONIZING SIGNALS AND CODE SIGNALS, SAID CODE SIGNALS EACH HAVING COMPONENTS OF A PLURALITY OF DIFFERENT FREQUENCIES TO PROVIDE A DISTINCTIVE CODE SIGNAL, DECODER MEANS COUPLED TO EACH RECEIVER AND RESPONSIVE TO SIGNALS THEREFROM, SAID DECODER MEANS SEPARATING SAID CODE SIGNALS FROM SAID SYNCHRONIZING SIGNALS, AND CONTROLLER MEANS COUPLED TO SAID DECODER MEANS AND TO THE ASSOCIATED LOCAL STATION SIGNAL DEVICES, SAID DECODER MEANS APPLYING SAID SEPARATED SIGNAL DEVICES TO SAID CONTROLLER MEANS FOR CONTROLLING THE OPERATION OF THE LOCAL STATION SIGNAL DEVICES IN PREDETERMINED TIMED RELATION BY THE SELECTED SYNCHRONIZING SIGNALS AND FOR CONTROLLING THE MODE OF OPERATION OF SELECTED LOCAL STATION SIGNAL DEVICES IN ACCORDANCE WITH THE DISTINCTIVE CODE SIGNAL.