Colorado Revised Statutes Title 44. Activities Regulated by the Department of Revenue § 44-20-301. Definitions

(1) “Motor vehicle” means every self-propelled vehicle intended primarily for use and operation on the public highways and every vehicle intended primarily for operation on the public highways that is not driven or propelled by its own power, but which is designed either to be attached to or become a part of a self-propelled vehicle; it does not include farm tractors and other machines and tools used in the production, harvesting, and care of farm products.