Michigan Compiled Laws, Chapter 247. Highways § 247.957

(a) By resolution, the governing body of a county or city requests that a particular named route lying within its jurisdictional boundaries be added to or deleted from the Pure Michigan byway system. The department shall not add a route to the system if the governing body of a county or city adopts a resolution requesting that a route not be added. The department shall remove a route from the system within 1 year after a resolution is adopted by a county or city requesting removal.

(b) The department proposes to add or delete any named route or portion of a route to the Pure Michigan byway system.

(c) The department proposes any action that would result in a change in the scenic, historical, or recreational character of any route on the Pure Michigan byway system that is determined to be substantial by the department.