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.

Red lights are for fire trucks, and blue means law enforcement. But what about green lights on a car? We have the answer.

Humans have a new way of seeing infrared light, without the need for clunky night-vision goggles. Researchers have made the first contact lenses to convey infrared vision — and the devices work even ...

If you’ve driven on William Hilton Parkway recently, you may have noticed the new flashing lights at certain crosswalks on the north end. The new lights, called rectangular rapid flashing beacons, are ...