Signal light traffic

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December 10, 1868 the first traffic light was installed outside of the British Houses of Parliament. It was installed to control traffic on Bridge Street, Great George Street, and Parliament Street. The original idea came from railway engineer J.P. Knight and was constructed by the railroad signal engineers Saxby and Farmer. The first traffic light resembled a railroad signal. There were two gas lamps, a red and green lamp that were used for night time use. The gas lamps were held by…

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On this day in 1923, the U.S. Patent Office grants Patent No. 1,475,074 to 46-year-old inventor and newspaperman Garrett Morgan for his three-position traffic signal. Though Morgan’s was not the first traffic signal (that one had been installed in London in 1868), it was an important innovation nonetheless: By having a third position besides just “Stop” and “Go,” it regulated crossing vehicles more safely than earlier signals had.