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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.
Stop signs are retroreflective. In this night photo, the person is barely visible, while the sign is brightly lit by the camera's flash.The stop sign is specified with the English legend STOP in the United Nations Convention on Road Signs and Signals. It is one of few such signs that originated in the United States.