Mich. Comp. Laws § 247.72: Highways; noxious weeds; duty of officials to prevent growth.

Sec. 12.

It shall be the duty of the state highway commissioner to prevent all noxious weeds as defined in this act from growing within the right of way of any highways under his jurisdiction. It shall be the duty of each county road commission to prevent all noxious weeds as defined in this act from growing within the right of way of any highways under their jurisdiction.