I've been to Breckenridge and to Frisco and I've seen ebikes on the trails between the two towns, also ebike dealers in town rent and give tours on this trail, so that should answer that question. Personally I would ride any ebike, class I, II, or III and never feel I was going to be stopped and questioned, mainly because I don't ride in a way that gives attention to doing something wrong, most riders that are stopped are probably in the wrong by riding too fast, riding trails that are marked, NO BICYCLES", or riding on sidewalks where bikes are not permitted. All being said, if law enforcement offices are going to stop every ebike to see it its legal or not, they got too much time on there hands.