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Red Light, Green Light : The Invention of the Traffic Signal : Design Observer
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日期：2025-06-03
Lester Wire, with his two color traffic signal The traffic signal was first invented in 1912 — by a Detroit policeman named Lester Wire — as a two-color, red-and-green light with a buzzer to warn pedestrians ahead of the impending transition. In 1920, thi...看更多
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