Steven, you already do:
Colorado[edit]
Ebike definition in Colorado follows the HR 727 National Law: 20 mph (30 km/h) e-power and 750 W (1 hp) max, 2 or 3 wheels, pedals that work. Legal low-powered ebikes are allowed on roads and bike lanes, and prohibited from using their motors on bike and pedestrian paths, unless overridden by local ordinance. The city of Boulder is the first to have done so, banning ebikes over 400W from bike lanes. Bicycles and Ebikes are disallowed on certain high speed highways and all Interstates unless signed as "Allowed" in certain rural Interstate stretches where the Interstate is the ONLY means of travel.
[65]
The only exception is the throttle classification which I still maintain that if the legal top speed is 20 mph what does it matter if it is by throttle or pedelec? I have ridden plenty with a direct drive 1000w 48v system (legal in the state I live to have 1000w @20mph) that wouldn't go any faster than 20 mph at full throttle, and in fact was hard to get to go much faster due to the parasitic drag of the motor past that point pedaling downhill with a tail wind. Anyone can over ride that feature via the controller but in doing so they are breaking the law. I realize there is a movement against throttles but some of us prefer them and as long as we are within the regs why say we can't use them as long as we stay within the regulated speed limit?
Anything over 20 mph is a moped class and CO has rules for that also.