"William Phelps ___ inventor of the stop sign and the crosswalk" NYT crossword answer is:
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William Phelps was an American inventor who is best known for creating the stop sign and the crosswalk. He was born in 1878 and worked as an engineer for the city of Detroit. He was inspired to create the stop sign after witnessing a fatal car accident in 1920. He also designed the first crosswalk in 1922, which was installed in Detroit. His inventions have helped to make roads safer for pedestrians and drivers alike.