When I was in college I regularly would drive down to my folks’ place in San Diego. I can’t tell you how many times late on a Friday night I would be driving down the Freeway with my car door open watching the lane markers slowly go by as I was essentially driving blind in a thick coastal fog. It was actually damn scary.
Have you ever wandered deep into the woods on a dark and moonless night only to stop suddenly, realizing that you had no idea where you were or if you were about to step into a prairie dog hole and break your leg only to be found three-days later half-eaten by drooling carnivores and nibbled on by ubiquitous insects.
Heavy fog is much like the black of night.