System for traffic signals for one-side passing

Details System for traffic signals for one-side passing System for traffic signals for one-side passing

1995-04-27

1997-03-11

Hofsass, Jeffery

Communications: electrical

Traffic control indicator

Traffic control or local controller failure indicator

340916, 340917, 340923, 340907, 340908, G08G 1097

Patent

active

056105991

ABSTRACT:
A system for traffic signals for one-side passing, which realizes efficient traffic control during abnormal operation of detectors or the night with little traffic density. Traffic signals 6 and 7 are provided with detectors 8 and 9 for detection of passing of vehicles respectively. Both traffic signals repeat traffic lighting in a cycled manner such as green-red, red-red, red-green and red-red by a sensitive controller 10. Owing to an ill-detection switching device 71, if there is no detection signal input by the detector of one traffic signal within a switch holding time after detection signal is input by the detector of the other traffic signal, the green lighting of one traffic signal will be shifted to a fixed-cycle operation until detection signal input by the detector. The traffic signal shifted to the fixed-cycle operation will be restored to the sensitive operation if the detection signal is input by the detector.

REFERENCES:
patent: 3522581 (1970-08-01), Clark et al.
patent: 4433324 (1984-02-01), Guillot
patent: 5252969 (1993-10-01), Kishi

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