Originally Posted by
Sharpshin
Just to clarify, in theory at least I could ride most of the 117 miles from Great Falls to Boulder along the shoulder/access road of I 15?
Just finished another trip in Montana. IIRC, every inch of Interstate Highway in the state is bike-legal, even when frontage roads are present. You have to be careful with frontage roads though. Some dead end. Need to check them out on maps.