Add Yahoo as a preferred source to see more of our stories on Google. (WHTM/NEXSTAR) – On many traffic signals found throughout the United States, there is a small light that is placed in between or ...

You may have noticed some traffic lights with a white light that works independently of the others. They're not for normal cars; here's what they're for.

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.

The concept of the traffic light actually dates all the way back to the 1860s, where gas-lit signals were placed on the posh streets that lined the Houses of Parliament in London. Of course, back then ...

PENNSYLVANIA (WHTM) — On many traffic signals found throughout the United States and Pennsylvania, there is a small light that is placed in between or off to the side of the traffic signal lights.