A. No person shall be required to obtain the registration certificate, license plates, or decals for or pay a registration fee for any motor vehicle, trailer, or semitrailer which is validly registered in another state and bears valid license plates issued by that state when the use of the vehicle has been contracted for by the owner or lessee of a farm as an incidental part of the harvesting of a crop from his farm. This exemption shall only be valid while the vehicle is engaged principally in transporting farm produce from the farm:
2. Along a public highway for a distance of not more than 20 miles to a storage house, packing plant, market, or transportation terminal;
4. When the owner of the vehicle has secured from the Commissioner an exemption permit for each vehicle.
B. The Commissioner, upon receipt of an application certifying that a vehicle is entitled to the exemption set forth in this subsection and, if the vehicle is a qualified highway vehicle under § 58.1-2700, payment of $150, shall issue an exemption permit on a form prescribed by him. The exemption permit shall be carried at all times by the operator of the vehicle for which it is issued or displayed in a conspicuous place on the vehicle. The exemption permit shall be valid for a period of 90 days from date of issue and shall be renewable by the procedure set forth in the foregoing provisions of this section.