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.

Add Yahoo as a preferred source to see more of our stories on Google. Q: Do you need to come to a complete stop before turning right at an intersection when the light is red, if the red traffic signal ...

Traffic lights can be tricky, depending on where you go. The response you have to a red light at an intersection in one state may not be the same response you need at an intersection in another state.