Traffic signal controller flasher for pedestrian clearance

Details Traffic signal controller flasher for pedestrian clearance Traffic signal controller flasher for pedestrian clearance

1976-09-08

1977-11-22

Habecker, Thomas B.

Communications: electrical

Selective

Having indication or alarm

315226, G08G 100

Patent

active

040598217

ABSTRACT:
An adapter unit converts a standard traffic controller system for operation to a pedestrian clearance mode where a DONT-WALK signal flashes during the interval when the green traffic signal is nearing the end of its period. The unit counts down line frequency to provide an on-off flash signal producing in the order of 55 flashes per minute and is interspersed in the connecting line between the standard controller switch and the pedestrian lamps. It operates with solid state circuits which are isolated from the controller's a-c voltage phases operating the traffic and pedestrian signal lamps.

REFERENCES:
patent: 3196388 (1965-07-01), Hill
patent: 3328791 (1967-06-01), Casciato
patent: 3906439 (1975-09-01), Hopla

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