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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.
[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] Potts was Superintendent of Signals for the Police Department of Detroit.
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 ...
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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 ...
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 ...