If you're comfortable with the present green, amber, and red traffic lights, be prepared to get uncomfortable. New research suggests that adding a white light will speed up traffic and improve safety ...

Red and green traffic lights have been around since the 1800s, when British traffic officers used to rotate gas lamps that burned red and green to control the movement of mostly horse-drawn vehicles.

There are three signals at a traffic light: red means stop, green means go, and yellow means that you have to slow done because the red light is about to appear. But how about if we have another light ...