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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]
[10] [11] [12] In 1920, the first four-way, three-colour traffic light was created by William Potts in Detroit, Michigan. [13] His design was the first to include an amber 'caution' light along with red and green lights. [ 14 ]
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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 ...
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Like other state highways in Michigan, the section of Woodward Avenue designated M-1 is maintained by MDOT. In 2021, the department's traffic surveys showed that on average, 68,359 vehicles used the highway daily south of 14 Mile Road in Royal Oak and 15,909 vehicles did so each day in north of Chicago Boulevard in Detroit, the highest and lowest counts along the highway, respectively. [5]
Four-way stops are an effective way to keep drivers safe on the road. According to the N.C. Department of Transportation, on average, converting intersections into four-way stops — also called ...