Mich. Comp. Laws § 124.462

Sec. 12. A public authority created under this act may plan, promote, finance, acquire, improve, enlarge, extend, own, construct, operate, maintain, replace, and contract for public transportation service by means of 1 or more public transportation systems and public transportation facilities. A public authority is a public benefit agency and instrumentality of the state with all the powers of a public corporation, to accomplish its purposes and to control, operate, administer, and exercise the franchise of the public transportation system and public transportation facilities, if any.