Mich. Comp. Laws § 257.7: "Commercial vehicle" defined.

Sec. 7.

"Commercial vehicle" includes all motor vehicles used for the transportation of passengers for hire, or constructed or used for transportation of goods, wares, or merchandise, and all motor vehicles designed and used for drawing other vehicles that are not constructed to carry a load independently or any part of the weight of a vehicle or load being drawn. Commercial vehicle does not include a limousine operated by a limousine driver, a taxicab operated by a taxicab driver, or a personal vehicle operated by a transportation network company driver.