I've tried, but the consensus seems to be
Some people say they're no different under the law. Then there are articles about new laws that would make them the same, which implies they aren't already. And then every locality can have their own rules anyway.
The whole thing is so stupid. We don't sort roads into some roads for Geo Metros where Ferraris aren't allowed because someone COULD go 200 in that car. Except for special practical cases (height/weight) roads are roads and we just set a speed limit.
Edit: I've also seen that sometimes bikes have disconnect-able throttles, and that you can disconnect them and then if there's even an issue you just show them that you've disabled it. I don't know how true that is.