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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.
1 James Hoge patented (1,251,666) manually controlled traffic lights in 1913, which were installed in Cleveland, Ohio a year later by the American Traffic Signal Company. 2  Hoge's electric-powered lights used the illuminated words stop and move. Around 1920, William Potts a Detroit policeman, invented (unpatented) several automatic electric traffic light systems including an overhanging four-way, red, green, and yellow light system. 2  The first to use a yellow light.