Wis. Stat. § 84.1026: Wisconsin Law Enforcement Officers Highway.

(1) The department shall designate and, subject to sub. (2), mark the route of USH 151, commencing at the Wisconsin-Iowa border and proceeding easterly to Manitowoc, as the “Wisconsin Law Enforcement Officers Highway” to commemorate and honor all law enforcement officers of this state for their dedicated public service in defending and protecting life, health, and property.

(2) Upon receipt of sufficient contributions from interested parties, including any county, city, village, or town, to cover the costs of erecting and maintaining markers along the route specified in sub. (1) to clearly identify to motorists the designation of the route as the “Wisconsin Law Enforcement Officers Highway,” the department shall erect and maintain the markers. No state funds, other than from the receipt of contributions under this subsection, may be expended for the erection or maintenance of the markers.