(WHTM/NEXSTAR) – On many traffic signals found throughout the United States, there is a small light that is placed in between or off to the side of the traffic signal lights. Sometimes you see them ...

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 ...

Traffic lights help traffic flow by directing specific lanes to go and others to stop. Some are more complex and include signals for buses. But at the end of the day, they're devices with red, yellow, ...

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.