to: importers wholesalers car auctioneers and car consultants specialist motor vehicle auctioneers insurance or finance companies and storage providers that sell vehicles to the public (unless they do this through a registered motor vehicle trader) "a road vehicle that is drawn or propelled by mechanical power and is of the kind ordinarily acquired by consumers for personal, domestic or household use. " The key part of the definition is in bold. As an example, for the purposes of the MVSA, a motor vehicle may be: a car a motorhome an off-road vehicle a motorcycle over 60cc If you are carrying on the business of motor vehicle trading and selling motor vehicles such as these you will be required to register as a motor vehicle trader. The same section also defines what is not considered to be a motor vehicle: an invalid carriage a moped a motorcycle under 60cc tractors or farm machinery trailers (including caravans) wrecks and dismantled vehicles If you are selling vehicles such as these you will probably not be required to register as a motor vehicle trader, however you may wish to check with your legal advisor. Note: A four wheeler farm bike would normally not be considered a 'motor vehicle' under the MVSA as it is classified as farm machinery.  However, if the four wheeler is being purchased to be used on the road or for personal use it will be considered a 'motor vehicle'. If you are involved in selling vehicles to other motor vehicle