Wis. Stat. § 194.43: Private motor carriers; regulation by department.

The department may regulate the operations of private motor carriers, including the power to designate from time to time the public highways over which private motor carrier vehicles may or may not be operated and to designate the time that such vehicles may or may not be operated thereon so as to prevent congestion which shall affect the safety of persons and property upon such public highways; to require the display of satisfactory evidence that such vehicle is not being used for common or contract motor carrier purposes; and to prescribe reasonable and necessary rules and regulations for the safety of operation of private motor carriers.