Emergency traffic control system with security transmission codi

Details Emergency traffic control system with security transmission codi Emergency traffic control system with security transmission codi

1975-11-05

1977-04-05

Habecker, Thomas B.

Communications: electrical

Selective

Having indication or alarm

343225, 325 30, G08G 100

Patent

active

040165329

ABSTRACT:
An emergency traffic control system is disclosed for use with emergency vehicles to control traffic signal lights. A coded transmitter employing frequency shift keying is provided in the emergency vehicle and upon actuation, transmits a coded signal to a traffic signal light which is provided with a receiver. Upon reception of a verified signal, the receiver causes the signal light to indicate a steady red in all directions. The emergency system further includes a test circuit for positively determining whether the traffic signal is under control of the emergency vehicle to prevent an accident if two emergency vehicles are simultaneously trying to control the same traffic signal light.

REFERENCES:
patent: 3114127 (1963-12-01), Ramsey
patent: 3247482 (1966-04-01), Lesher
patent: 3906348 (1975-09-01), Willmott
patent: 3939465 (1976-02-01), Helton

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