Amelia asked about Glacier and this highway. DO go over it; it is magnificent!
We were over it four times (both ways) in a six-day stay at Glacier, finding
new joys each time--many places to stop, hike, photograph, explore. One
time (last day of August that year) we were the last car allowed up to
top of it due to sudden snow storm that blanketed the area; we had a 4WD
car, so they let us go. Once we got up there, we were stuck, along with
everyone else, for about two hours till they opened the road again, so
we went walking in the snow--gorgeous! I don't think the road is fearsome
at all and can think of no really bothersome or scary places on it, but
I cannot judge how someone with a fear of heights might react. But exploring
the road certainly is the highlight of any trip to Glacier NP -- enjoy!
Pat in Baltimore