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Transcript of The Invention of the Stop Sign. The Stop Sign Progress/Changes Made on the Stop Sign 1915 1925 1935 1945 1955 1965 1975 1915- A man named William Phelps Eno invented a white sign with black letters, in Detroit, Michigan. 1922- Realizing the stop sign was so important, an association was formed to make more stop signs.
The American Traffic Signal Co. installed, on August 5, 1914, the first set of traffic signals, at East 105th street and Euclid Avenue in Cleveland. It was based on the patented (January 1918) design of James Hoge, which displayed the words STOP and MOVE.