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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.
Based on a design by James Hoge, who received U.S. patent 1,251,666 for his âMunicipal Traffic Control Systemâ in 1918, it consisted of four pairs of red and green lights that served as stop-go indicators, each mounted on a corner post.