"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 inventing the stop sign and the crosswalk. He was born in 1878 and was a civil engineer by trade. He was the first to recognize the need for a standardized traffic control system and developed the stop sign and crosswalk to help regulate traffic. His inventions have been used for over a century and are still in use today, making him one of the most influential inventors in history.