Red, yellow, and green seem obvious, but the story behind traffic lights is stranger than you might think.

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If you drive a car, you've likely found yourself at a stoplight. They're hard to avoid, with roughly 320,000 estimated to be in the U.S. But getting through them is sometimes harder than you may think ...

Through games like "Red Light, Green Light," books, and songs, children learn at a young age that green means go and red means stop. In much of the world, a solid red light at an intersection means ...