No person shall be required to obtain a driver's license to operate a road roller or road machinery used under the supervision and control of the Department of Transportation for construction or maintenance purposes. No person shall be required to obtain a driver's license for the purpose of operating any farm tractor, farm machinery, or vehicle defined in §§ 46.2-663 through 46.2-674, temporarily drawn, moved, or propelled on the highways. The term "road machinery" shall not include motor vehicles required to be licensed by the Department of Motor Vehicles.
Va. Code § 46.2-303