What are Fog Lights?
Fog lights are the lights mounted on the front of a car or truck which help visibility in foggy or misty conditions. They come in a variety of colors and intensities, but virtually all vehicles have them, and their assistance can be crucial to navigating poor weather. Traditionally fog lights are yellow, and the reason why is the subject of some speculation. A common claim is that they need to be a single color light rather than white light, to minimize dispersion as the light hits the water vapor and scatters in different directions. It is often said that though red might be a more ideal color, it already has connotations to drivers —- it is used for both stop lights and brake lights. Yellow, then, would seem to be the next-most-suitable choice, because it has the next longest wavelength of visible light. The problem with this idea, which sounds plausible scientifically, has to do with the size of the water molecules in fog. The molecules of water vapor are large enough that dispersio
