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In 1920, the first four-way, three-color traffic light was created by police officer William Potts in Detroit, Michigan. [ 14 ] [ 15 ] He was concerned about how police officers at four different lights signals could not change their lights all at the same time.
William Potts (May 1883 – 1947) was a Detroit police officer who is credited with inventing the modern, three-lens traffic light in Detroit in 1920. (A gas-powered, two-lens, red/green traffic signal was invented in London in 1868 by John Peake Knight, though after a short test installation, traffic lights were not seen again in the U.K. until 1929.) [1]
His first traffic light, a manually-operated wooden model, was built while he was head of the SLCPD's Traffic Bureau and installed in downtown Salt Lake City in 1912. Though Wire's traffic light was originally viewed with curiosity and disapproval, the public gradually accepted it over time, and by the 1920s Salt Lake City had developed an ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 19 February 2025. Signaling device to control competing flows of traffic This article is about lights used for signalling. For other uses, see Traffic light (disambiguation). "Stoplight" redirects here. For other uses, see Stoplight (disambiguation). An LED 50- watt traffic light in Portsmouth, United ...
William Phelps Eno (June 3, 1858 – December 3, 1945) was an American businessman responsible for many of the earliest innovations in road safety and traffic control. He is sometimes known as the "Father of traffic safety", despite never having learned to drive a car himself.
Charles Adler Jr. (June 20, 1899 – October 23, 1980) was an American inventor and engineer.He is most known for developing devices meant to improve transportation safety, including sonically actuated traffic lights, colorblind road signals, pedestrian push-buttons, and flashing aircraft lights.
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The tower elevated a police officer above the center of the intersection to direct traffic before it was replaced in October 1920 with the world's first four-way traffic light. [ 65 ] While Michigan was the second state to post route designations along its highway system in 1919, [ 62 ] Michigan actually began assigning internal trunkline ...