Mich. Comp. Laws § 257.57: “School bus” defined.

Sec. 57.

"School bus" means every motor vehicle, except station wagons, with a manufacturers' rated seating capacity of 16 or more passengers, including the driver, owned by a public, private, or governmental agency and operated for the transportation of children to or from school, or privately owned and operated for compensation for the transportation of children to or from school.