"Ok, I'm not a scientist but I've played one on Facebook. I think fog lights are yellow because it's the lowest wavelength (next to orange) that will still illuminate other objects well enough to be visible to us. That is only a guess…"
Hello Terry---from another Terry--- and welcome to this wonderful world of rationality, truth and peace.
Unbiased common sense, helped by science, leads to happy freethinking wisdom as you have found out.
We invite you to make good friends by joining the busy group "ORIGINS: Universe, Astronomy, Life, Earth, Humans, Religion, Gods, Atheism, Evolution, Darwin..." with 650 discussion topics and 3200 members.