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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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The first crow's nest traffic tower in the US was installed at the intersection of Woodward and Michigan avenues on October 9, 1917; the tower elevated a police officer above the center of the intersection to direct traffic before the structure was replaced in October 1920 with the world's first four-way traffic light. [51]
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 ...
The first crows nest traffic tower in the US was installed at the intersection of Woodward and Michigan avenues in Detroit on October 9, 1917. 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]