A buddy of mine in California told me about "Tulle Fogs" (sp?) where you couldn't see 20 feet in front of you. Said they were inching along and kept hearing muffled "thuds" (WTH??) They pulled off the road for a while. Later on they saw the results of a 20+ car pileup and understood that those "thuds" were the people who were still barreling past them at 70 mph.
Yep, No sense at all.