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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.
Yellow old-style stop sign (1924-1954) Vs. Red new-style stop sign (1954-present ) Originating in Detroit, Michigan in 1915, the earliest stop sign had black letters on a white background and was somewhat smaller in size than the one today. The smaller sizes of stop signs were initially most common, in that they did not require larger punch presses. Due to confusion of drivers, the American Association of Highway Officials (AASHO) met in 1922 to standardize the stop sign.