<];^)
I don't doubt it.
About ten years ago, my brother-in-law and a couple of friends where on a multilane highway in the Smokies at night and ran into such a fog(cloud). They finally sent one guy out to try and guide them on foot to the side of the road but he couldn't find the center or side lines on his hands and knees right in front of the headlights. They finally gave up because the fog was too thick for him to move beyond touch distance of the car without risk of him getting lost.
They spent a longgggg night in the car waiting for the sun to burn it off.