Yellow light is white light with the blue (short wavelength) removed. High-frequencies are the most easily scattered, thus the blue sky from sunlight scattering through miles of atmosphere. And this is why "blue-blocker" filters on glasses and other optics allow you to see better in haze. When blue light bounces off or passes through things, it is more likely to come off in a slightly different direction looking "fuzzy". When blue light enters the eye it scatters and dazzles more than longer wavelengths, especially in older, hazier eyes.
Yellow or amber lights help slightly in fine haze or fog, not so much in most conditions. Yellow lighting looks flat because it removes some optical cues that help us determine distance and rate of closure. I run somewhat brighter HIR bulbs, and occasionally wear amber glasses when driving in haze, even though I look (even more) like a geek. :nerd: