Wis. Stat. § 86.025: Camping on highways.

It shall be unlawful for any person or persons to camp in wagons, tent or otherwise on the public highways or lands adjacent thereto, after a notice to remove therefrom by the owners of such adjacent lands, or the owner of land abutting on the highway, or by a member of the board of supervisors or any trustee of any town or village where such camping place is made. Any person or persons violating the provisions of this section shall be deemed guilty of a misdemeanor, and upon conviction thereof shall be fined not exceeding $10, or imprisoned in the county jail not exceeding 30 days, or both.