Where Traffic Lights Came From

We've been given the green light to tell you abou...  ...the green light to tell you about the origin of traffic signals . Go ahead and cruise through the text, and we'll...  ...stion, but there's one thing we do know for sure - traffic congestion predates the automobile. Long before t...  ...8, a British railro...

http://www.neatorama.com/2012/12/14/Where-Traffic-Lights-Came-From/