Abstract
Radio coordinated traffic light control permits the elimination of the conventional multiconductor cable which must tie together all traffic lights in a system. A VHF carrier modulated with audio-frequency control tones permits the radio coordinated system to perform the same as with the use of a cable plus the possibility of gaining additional benefits. All conventional traffic light control equipment may be used without modification. Several systems have been installed with complete success, gaining advantages in cost and flexibility. It may be expected that this form of control will grow rapidly within the next few years.
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