FWIW, Colorado state laws says you can ride up to 50cc on a bike path unless the local city or some other governmental agency says otherwise. Subject came up a couple years ago when a person asked about alternative routes from Eagle to Vail. Non freeway is a very twisty slow route 50 miles long that takes 2:45 minutes vs 8 miles by either I-70 or the bicycle trail. Asking the state patrol since though technically legal her 150cc wasn't really a good fit for I-70. Cop told her to take the bicycle trail and if anyone said anything tell them 50ccs were legal and the 150 on the side was just a model not size. She didn't want to do that because of bicycle rider's probable wrath. I though the cop was being very pragmatic since he thought the bike trail was a better option than the interstate. Edit make that 2:45 hours not minutes and she needed to go not for pleasure ride.