Early traffic lights had only red and green, which unsurprisingly made intersections rather chaotic. Who invented the yellow ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. We see traffic lights all the time.

Some things are so ubiquitous that it's easy to forget they're designed for a reason. With more than 300,000 traffic lights set up across the United States, it's easy to take how they look for granted ...

(WHTM) — We see traffic lights all the time. Sometimes we get green lights, and sometimes we hit all the red lights on our commute to work. But, while sitting at a red light, have you ever wondered ...