Traffic controller, electromechanical sequencer for a traffic co

Details Traffic controller, electromechanical sequencer for a traffic co Traffic controller, electromechanical sequencer for a traffic co

1976-08-02

1977-06-21

Habecker, Thomas B.

Communications: electrical

Selective

Having indication or alarm

340 37, G08G 100

Patent

active

040315070

ABSTRACT:
The phase sequence of a traffic light is determined by a reprogramable revolving encoder. In one embodiment the encoder has a light source and a drum revolving therearound with selectively positioned apertures. Photocells positioned outside the drum detect the apertures as they move passed to control the light switches in the traffic controller. Some photocells may be deactivated subject to DEMAND, causing the associated traffic phase to be omitted each cycle unless street traffic trips an activation circuit. The encoder has a homing circuit for startup and synchronization with associated traffic lights.

REFERENCES:
patent: 3090032 (1963-05-01), Shand
patent: 3605084 (1971-09-01), Matysek
patent: 3815085 (1974-06-01), Leclercq

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