Detroit Police Officer William Potts introduced the nation’s first four-way, tri-colored stoplight in 1920 at Woodward and Fort Street, replacing hand-signaling officers and improving safety as car traffic surged. The original signal, now displayed at the Henry Ford Museum, launched a system that quickly expanded across downtown and became a national standard by the mid-1930s, cementing Detroit’s role as the birthplace of modern traffic control. For more stories like this, subscribe to our newsl
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