Reduced Visibility

Interesting take. When I was in CDL school, our final day of road training before testing. Three trucks, 3 instructors, 9 students. Headed up US 285 W. of Denver. Bright sunny day, not a cloud around. We went as far as the top of Kenosha Pass before turning back, stopped lunch, the instructors bought. When we left the diner, I was in the lead truck, the other two trucks had the smokers, so they had to take a smoke break before leaving, we had a 20 minute head start on them. About half way, we hit fog so thick, visibility for a good portion was 5' off the hood ornament. I was the unlucky student that was driving. The other two yahoos fell asleep in the chairs in the sleeper, so it was me and the instructor. For 8 miles, we crawled, maybe 10 mph tops, twice we almost rearended other vehicles that were also crawling slower than us, except, we had our lights and hazards on, they had no lights on at all, the instructor and I basically had our noses pressed to the windshield trying to see. By time we cleared that fog, there were at least 2 dozen cars behind me, all had their hazards on, probably only a couple of times could I actually see a glimpse of them in my mirrors. The instructor had me pull over and stop so we could both release some tension. IIRC, he had 20 yrs exp., said that was some of the thickest fog he had ever driven in. The screwiest part of that fog, those other two trucks hit a tiny little patch of it, maybe 100' of it. The two guys who were in my truck, slept through all of the fog.