Mich. Comp. Laws § 3.167
If a jurisdiction permits or requires the licensing of a fleet of vehicles in interstate or combined interstate and intrastate commerce and payment of registration fees, license taxes, or other fixed fees on that fleet on an apportionment basis commensurate with and determined by the miles traveled on and the use made of the jurisdiction's highways, or any other equitable basis of apportionment, and exempts a vehicle registered in another jurisdiction under the apportionment basis from the requirement of full payment of its own registration, license, or other fixed fees, then the board by agreement may adopt the exemption with respect to a vehicle of those fleets, whether owned by a resident or nonresident of this state and regardless of where based. The agreement, under the terms, conditions, or restrictions as the board considers proper, may provide that an owner or operator of a vehicle operated in interstate or combined interstate and intrastate commerce in this state shall be permitted to pay registration, license, or other fixed fees on an apportionment basis commensurate with and determined by the miles traveled on and the use made of the highways of this state or any other equitable basis of apportionment determined by the board. An agreement shall not authorize, or be construed as authorizing, a vehicle so registered for hire to be operated in intrastate commerce in this state unless the owner or operator of the vehicle has been granted intrastate authority or rights by the Michigan public service commission.
MCL 3.167