in MI the minimum size for the freeway is 125cc, but in order to go more than 40mph on state roads a vehicle must be registered as a motorcycle. this means it must have either an engine larger than 49cc or a multiple speed transmission. most "50cc" scooters purposely have engines under 49cc and cvt transmissions so that they do not need to be registered or insured. if you are caught going over 45 on a public road on a non registered noninsured vehicle, you can get in lots of trouble. that being said, if you register and insure your scooter as a motorcycle, you ought to be ok on rural highways. just not on expressways.
Again, this only applies to MI, as there are NO federal road laws. The Federal Government cannot legally pass road laws, they can threaten to take away highway funds though.
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