A motor vehicle bearing a motor vehicle dealer distinguishing number tag assigned to a motor vehicle dealer may be operated by a dealer, his authorized representative or customer as provided in this regulation for the following purposes and uses:
1. For the purpose of testing and adjusting such vehicle in the vicinity of the dealer's place of business.2. For a one-time demonstration of a heavy truck, either empty or under load, by prospective bona fide purchasers. However, any such use shall be limited to a period of not more than four (4) days. Any person operating a heavy truck under the provisions of this paragraph shall carry with him at all times while operating such truck written authority to do so signed by the dealer. A copy of such authorization shall be retained by the dealer.3. For business or demonstration use of the dealer or any full-time employee of the dealership or prospective purchaser.4. For use by a customer whose vehicle is being repaired by the dealer, but such use shall not extend longer than ten (10) days and shall be authorized by the dealer in writing. Such authorization must be kept in the vehicle while in use.35 Miss. Code. R. 7-04-01-201