Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Steven M. Colby0
Date of Patent
February 28, 2006
0Patent Application Number
108656030
Date Filed
June 10, 2004
0Patent Citations Received
Patent Primary Examiner
Patent 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.
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