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The stop light (or traffic light) was invented by J. P. Knight, a British railway engineer.
http://en.wikipedia.org/wiki/J._P._Knight
The Red Stop light On traffic lights was designed by James Hoge on September 22, 1913.
(USPTO # 1251666 Sept. 22, 1913) http://en.wikipedia.org/wiki/Traffic_light#History
This allowed Police and Fire stations to control the signals in case of emergency.
The first four-way, three-colour traffic light was created by police officer William Potts in Detroit in 1920.
In 1923, Garrett Morgan patented a traffic signal device, although it was not a precursor of the modern traffic light. Ashville, Ohio claims to be the location of the oldest working traffic light in the United States, used at an intersection of public roads until 1982 when it was moved to a local museum.
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