Wis. Stat. § 349.12: Authority to designate no-passing zones.

The department, county highway committees and local authorities, in regard to highways under their respective jurisdictions, may determine, in accordance with standards and procedures adopted by the department, where overtaking or passing or driving to the left of the center of the roadway would be especially hazardous and may, by signs approved by the department or by a yellow unbroken line on the pavement on the right-hand side of and adjacent to the center line or a lane line of a roadway, indicate the beginning and end of such zones.