Michigan Compiled Laws, Chapter 247. Highways § 247.654

Sec. 4. All roads under the jurisdiction of the board of county road commissioners in each of the several counties of the state not included in the county primary system as finally approved shall be certified to and reviewed and approved or deleted by the state highway commissioner in the same manner as provided in section 2 hereof  1 for the county primary road system and when finally approved by the state highway commissioner shall constitute and be the county local road system of that county, which may thereafter be added to or deleted from in the same manner as provided in section 3 of this act for the county primary road system.