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.

You must have seen traffic lights while coming and going on the road. It plays an important role in maintaining order on the road and in ensuring the safety of the people. The three colors (Traffic ...

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 ...