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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 Law of Stop Signs. Traffic accidents are a necessary evil with motor vehicles given their speed. Thus, with the advent of cars came stop signs and a legal obligation to come to a complete stop at a designated intersection. Such designation became the standard, red hexagonal stop sign, with the word STOP written in the middle.