Originally Posted by
Comfort is King
If traffic gets backed up more than several cars, I can pull off.
I've seen slow vehicles such as loaded trucks holding traffic, going off road just to let traffic through and then going back on the road again once the pile has passed. I'm not sure whether it's a driving rule or just driver courtesy but my uncle who taught me how to drive in another country told me the same thing if I'm driving too slow and backing up traffic to get off road and let them pass, but only if it's safe for me to do so like I won't do it in a super steep section.
Not every country on the planet observe this courtesy rule but on some two-lane mountain roads, the lane becomes three, especially on the uphill sections so that slow vehicles can be passed safely.
But for the OP's sake, 75 rider group would be impossible to move off the road to let the backed up traffic pass. The best advice is just don't do it, unless it's officially sanctioned and vehicle detours and support are in order.