All township and district roads established under this Division of this Code shall be not less than 40 feet in width, except as provided in Section 6-327.
     Highway commissioners in single township road districts may annually determine that certain roads in the district are vital to the general benefit of the district and designate them all or in part as arterial district roads. The designation must be approved by the county superintendent of highways, after notice and hearing, prior to the commissioners’ recording the roads with the county superintendent of highways. No road or portion thereof designated as arterial shall be closed or vacated without written approval of the county despite the road’s inclusion in any annexation or incorporation proceedings provided for in the Illinois Municipal Code. This paragraph does not apply to roads in home rule units of government nor the roads included in our annexation proceeding by home rule units of governments.
     This Division of this Code shall not apply to proceedings for laying out, widening, altering or vacating streets in municipalities, except as provided in this Section.