I have driven in fog in MI and TX, but never on unfamiliar roads and never very thick fog. What you describe is very scary but you handled properly. I think perhaps I would have pulled over and sat it out but I have the luxury of doing that.
My problem is those snow banks in MI...landed in a few more than one....but the Lord keeps pulling me out and setting me back on the road to go again another day.
Thanks for your graciousness.
P.S. I am not an adventurous driver though...I gotta go where I gotta go and then I gotta come home...period. I don’t explore or get winding around places I don’t know....not to say I have not gotten lost more than a few times just like these girls but never had a tragic result.
Deep culverts [to accommodate the snow-melt off the mountain] lined both sides of the road, so there was no place or side roads to pull off-of. We wished!
Stay-safe out there!