That's why some cyclists are adamant about not using a shoulder. It invites a squeeze play like the dumbass motor home driver attempted. Far be it for them to slow until they could safely pass.
Bicycles shouldn’t be on any road that doesn’t have a bike lane, let alone a 70mph highway. Few things worse than the summer chit show bike riders bring to MT. Bikes don’t pay for roads anyway, needs to be put into law.