Selective yellow illumination, produced by specialized lamps for adverse weather conditions, enhances visibility by scattering less than white light in fog, rain, or snow. This characteristic improves contrast and reduces the back-glare reflected towards the driver.
Improved visibility in challenging conditions represents a significant safety advantage. The selective transmission properties of yellow light minimize the “veiling luminance” effect the bright halo experienced when white light reflects off precipitation. Historically, yellow lamps have been favored in regions with frequent fog or snowfall, and their effectiveness has been supported by research into visual perception and atmospheric optics.