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Early Traffic Control

  • December 19, 2014
  • By KIDS DISCOVER

A little more than 100 years ago, the first electric traffic signal was installed at a Cleveland intersection. The red-green system, based on a design patented by James Hoge, used the words “Stop” and “Move.” An operator in a nearby booth controlled the lights with a switch. (Leung Chopan / Shutterstock)

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