Traffic signal

Details Traffic signal Traffic signal

2006-02-28

2006-02-28

Trieu, Van T. (Department: 2636)

Communications: electrical

Traffic control indicator

C340S815450, C340S815650

Reexamination Certificate

active

07006011

ABSTRACT:
Systems and methods of controlling traffic including a traffic signal. The traffic signal including one or more lamps configured to each display a plurality of patterns by selectively powering different groups of bulbs. Embodiments of the invention include lamps configured to alternatively display an arrow pattern, a filled circle pattern, a bar pattern or other pattern meaningful to traffic control. The pattern displayed is optionally dependant on available power sources, ambient light, traffic flow, time of day or day of week.

REFERENCES:
patent: 5808592 (1998-09-01), Mizutani et al.
patent: 6380865 (2002-04-01), Pederson
patent: 6528954 (2003-03-01), Lys et al.
patent: 6879263 (2005-04-01), Pederson et al.

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