We just did a pre-season, automobile-less Going-To-The-Sun-Road bike ride on a picture perfect day.
There is a short window on this fabled Glacier National Park road — between snow removal and the busy summer auto traffic — for bikes/hikes only.
We did it years ago on our snail-bikes, but this time we used our cheater e-bikes. Since it involves quite a climb, e-bikes have made this once semi-obscure event, now very popular.