The Mayor of the District of Columbia may enter into an interstate agreement with the Commonwealth of Virginia or with the State of Maryland, or with both, which shall stipulate that any person:
(1) who operates in the District of Columbia and in the state which is a party to the agreement a single unit motor vehicle which has 3 or more axles and which is designed to unload itself;(2) who has registered that motor vehicle in the District of Columbia or in that state; and(3) who but for the agreement is required to pay the fee for an annual hauling permit prescribed by § 6-703.01, and a similar fee imposed on the motor vehicle by that state, shall not be required to pay a fee described in clause (3) of this section which is imposed by a jurisdiction other than the jurisdiction in which the motor vehicle is registered. If the Mayor enters into an interstate agreement under this section, he may adjust the annual hauling permit fees of the District of Columbia referred to in clause (3) of this section so that the total amount of fees (including registration and inspection fees) required for the operation in the District of Columbia and in each state which is a party to such agreement of the vehicles referred to in clause (1) of this section shall be uniform.June 30, 1972, 86 Stat. 392, Pub. L. 92-327, § 1. Motor vehicles and traffic, operators' permits, registration, exemption of nonresidents, see § 50-1401.02. .