Martinjmpr
Wiffleball Batter
.You can drive as slow and as carefully as you want. How is that going to stop some idiot from plowing into the back of you if they can't see you?
Anybody dumb enough to drive into a dust cloud without knowing what's in it is likely to be going fast enough that he won't be able to stop anyway.
.
I've driven in the desert for years and have never witnessed nor experienced a situation like the OP is talking about where vehicles are driving at speed into blind dust clouds. I guess maybe it happens in off road racing but for recreational off roading I've never seen it. And I spend a LOT of time in the desert. Not only that, I know other guys who spend even more time than me off roading in the desert and I don't see them running "dust lights" either.
.
A rear facing fog light would make more sense to me, even though where I live we don't generally get heavy fog and what fog we get typically lifts after the sun comes up.