Regulatory Classification
Most jurisdictions do not differentiate between scooters and motorcycles. For all legal purposes in the United States of America, the National Highway Traffic Safety Administration (NHTSA) recommends using the term motorcycle for all of these vehicles. However, while NHTSA excludes the term motor scooter from legal definition, it proceeds, in the same document, to give detailed instructions on how to import a small motor scooter.
Read more about this topic: Motor Scooters