What type of vehicles are NOT classified as used motor vehicles?

The classification of vehicles as used motor vehicles generally refers to those that have had prior ownership or usage. Newly registered vehicles are considered 'new' because they have not been sold or transferred from a previous owner, even if they are being registered for the first time. This makes them distinct from used vehicles, which have a history of previous ownership.

In contrast, vehicles older than 10 years, leased vehicles, and rebuilt vehicles typically fall under the definition of used motor vehicles as they have either been previously owned, have been the subject of a lease agreement (implying prior use), or have undergone repairs and can no longer be considered new. Thus, these classifications affirm that "newly registered vehicles" indeed do not fit into the category of used motor vehicles, confirming the rationale behind the correct answer.