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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.
Now Deaf people had a set of manual gestures, or signs, they could use for communicating and becoming educated. So you might say it was Juan Pablo Bonet who invented sign language. Then, in France in the 18th century, along came Charles-Michel de l 'Epee.