Emergency control system for traffic signals

Details Emergency control system for traffic signals Emergency control system for traffic signals

1978-10-18

1980-09-16

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340147LP, 455 99, 340694, G08G 107

Patent

active

042232953

ABSTRACT:
An emergency control system for traffic signals in which a coded emergency signal transmitted from an emergency vehicle is picked up by a directional receiver associated with the traffic signals and a command emergency signal generated which activates a control unit by means of which the existing state of the traffic signals is sampled and the information stored after which the control unit switches control of the traffic signals from the main controller to the control unit which determines from the stored information the existing state of the traffic signals and the information from the receiver as to the direction of approach of the emergency vehicle, the correct sequence for placing the traffic signals in the proper state, the discontinuation of the emergency signal initiating the return of control of the traffic signals to the main controller by the control unit on the first amber light function output from the main controller.

REFERENCES:
patent: 2881409 (1959-04-01), Cook et al.
patent: 3257641 (1966-06-01), Campana et al.
patent: 3550078 (1970-12-01), Long
patent: 3631387 (1971-12-01), Hill et al.
patent: 3638179 (1972-01-01), Coll et al.
patent: 3881169 (1975-04-01), Malach
patent: 4017825 (1977-04-01), Pichey
patent: 4162477 (1977-07-01), Munkberg

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