Wis. Admin. Code Trans § Trans 276.08
When a highway designated in s. Trans 276.07 is closed and detoured as authorized by s. 84.02(10) (b), Stats., vehicles being operated under ss. 348.07(2) (f), (fm), (gm), (4) and 348.08(1) (e), Stats., may be operated on the detour until the regular route of the highway is reopened to traffic. When a bypass or alternate route is recommended by the department for a highway designated in s. Trans 276.07 in order to reduce congestion, improve access or improve public safety, vehicles being operated under ss. 348.07(2) (f), (fm), (gm), (4) and 348.08(1) (e), Stats., may be operated on the recommended bypass or alternate route. Notice of a recommended bypass or alternate route may be given by signs or other appropriate methods.
Wis. Admin. Code Department of Transportation Trans 276.08