When you’re driving and see flashing lights in your rearview mirror or on the side of the road, it’s important to understand ...

Megan Kate Nelson - Author, Saving Yellowstone: Exploration and Preservation in Reconstruction America Driving home from ... still play a version of it, Red Light, Green Light.

If you have ever closely observed a helicopter, you must have noticed the red and green lights. In fact, these lights are not only present on helicopters but also on commercial and private airplanes.