What are fog lights? The difference between front and rear fog lamps?
Fog lights differ from running lights in internal structure and predetermined position. Fog lights are usually placed at the bottom of a car, which is closest to the road. Fog lamps have a beam cutoff Angle at the top of the housing and are designed only to illuminate the ground in front of or behind vehicles on the road. Another common element is a yellow lens, a yellow light bulb, or both. Some drivers think all fog lights are yellow, the yellow wavelength theory; Yellow light has a longer wavelength, so it can penetrate a thicker atmosphere. The idea was that yellow light could pass through fog particles, but there was no concrete scientific data to test the idea. Fog lamps work because of mounting position and aiming Angle, not color.
