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In 1917, the first interconnected traffic signal system was installed in Salt Lake City, with six connected intersections controlled simultaneously from a manual switch. [3]: 32 In 1920, the first four-way, three-color traffic light was created by police officer William Potts in Detroit, Michigan.
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] The first four-way, three-colour traffic light was created by William Potts in Detroit, Michigan in 1920. [13] His design was the first to include an amber 'caution' light along with red and green lights. [14] Potts was Superintendent of Signals for the Police Department of Detroit.
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]
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Garrett Augustus Morgan Sr. (March 4, 1877 – July 27, 1963) was an American inventor, businessman, and community leader.His most notable inventions were a type of three-way traffic light, [1] and a protective 'smoke hood' [2] notably used in a 1916 tunnel construction disaster rescue.
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 dual-lane roundabout has resulted in more crashes than those recorded when the intersection was still a four-way traffic signal intersection. “That’s not necessarily unusual,” GeDeros said.