“Front fog lamps provide a wide, bar-shaped beam of light with a sharp cutoff at the top, and are generally aimed and mounted low. They may be either white or selective yellow. They are intended for use at low speed to increase the illumination directed towards the road surface and verges in conditions of poor visibility due to rain, fog, dust or snow.”
They must be white or yellow in order to increase short range visibility in foggy situations. Blue (xenon) lights for example might cut through too far, or reflect off fog making it even harder to see. Itr get scientific, and it involves a light beams freqeuncy and wavelength (the characteristics that determine what color we see light as), but all you need to know is that they must be white or yellow.
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