On many traffic signals found throughout the United States, there is a small light that is placed in between or off to the side of the traffic signal lights. Sometimes you see them blink when ...

Traffic lights have been with us since 1868, when the first gas-powered set was switched on in London. These lights used a semaphore system similar to those used by the railways of the day and ...

This is an archived article and the information in the article may be outdated.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. (WHTM/NEXSTAR) – On many traffic signals ...

If you've ever wondered how traffic lights work and how they can detect your car, you've probably also been curious about those small blue lights mounted above the signals themselves. These blue ...