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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 âBiograph Girl,â as she was known, based on her work with the film company, wasnât the very first person to come up with a turn signal. In 1909, a British man named Percy Douglas-Hamilton patented a set of hands, one attached to each side of the car, which could be illuminated to indicate a coming turn. âPeople look at and cite that patentâ as the first, said John Heitmann, a professor at the University of Dayton who specializes in automobile history.