Wis. Stat. § 194.08

None of the provisions of this chapter shall be deemed to deprive the department or any municipality of any jurisdiction they now have or which may be conferred upon them over the public highways of the state, nor prevent the department or any municipality from suspending at any time the right of common motor carriers of property or of passengers, contract motor carriers or private motor carriers to operate motor vehicles over any public highway when necessary for the proper preservation or policing of the public highway.