Too fast for conditions is too fast for conditions but the camera angle through fog can be deceiving. If the fog is low to the ground, looking down through the thin layer of ground fog is completely different from looking through it on a horizontal plane.
Back when I flew general aviation airplanes, if I saw a halo around streetlights I knew the temperature - dew point spread was closing and to land ASAP. I've also overflown airports where I could see everything, right down to the runway center line and 3 minutes latter, ended up in soup so thick I couldn't hardly see 50 feet in front of me when 20 feet off the ground.