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 ...

While we may be used to seeing cameras on top of traffic lights at major intersections, they're used for more than simply watching out for red-light runners. In fact, there are two main types of ...

We all know what a basic traffic light is supposed to look like. There are three colors — red, yellow, and green — and they're arranged in that order, either from top to bottom or left to right in a ...