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Traffic Signals

Traffic Signals

When you stop on the red light, do you ever wonder who invented the traffic signal? Traffic lights are an invention by a railway engineer JP Knight in 1868. The first traffic light, installed in London was not electric but a manually operated gas lamp consisting of red and green light which exploded after a month. In 1920, William Potts added the yellow light. Later, in 1923 Garrett Morgan added a mechanical system so that the signal could be operated from a distance.

Posted on 7 . 8 . 2012


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