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How does a traffic light detect cars?

Announcer Welcome to Brain Stuff from http://www.HowStuffWorks.com where smart happens. Marshall Hi, I’m Marshall Brain with today’s question. How does a traffic light detect that a car has pulled up,...

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How Traffic Lights Work

Announcer Get in touch with technology with Tech Stuff from http://www.HowStuffWorks.com. Chris Pollette Hello again, everyone. Welcome to Tech Stuff. My name is Chris Pollette, and I am an editor at...

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