Communications: electrical – Traffic control indicator – Traffic control or local controller failure indicator
Patent
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
Ishizaki Minoru
Nomura Toshimitsu
Sato Akira
Takeda Kaoru
Yasui Kazuhiko
Hofsass Jeffery
Mannava Ashok
Nihon Samicon Co. Ltd.
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