Wis. Admin. Code Trans § Trans 200.055
The first advance warning sign and the "END UTILITY WORK" sign shall be placed in accordance with the Wisconsin manual on uniform traffic control devices, the department's utility accommodation policy, or any other work zone traffic control guidance that has been accepted for regular use by the department with respect to the state trunk highway system, or a county, town, or municipality with respect to highways under their jurisdiction.
Wis. Admin. Code Department of Transportation Trans 200.055
Authority for the Manual on Uniform Traffic Control Devices is found at s. 84.02(4) (e), Stats. Section 227.01(13) (d), Stats., also states that the Department is exempt from rulemaking with regard to use of highways that is made known to the public by means of signs or signals. A copy of the Department's Utility Accommodation Policy may be obtained, without cost, by writing to the Division of Transportation Infrastructure Development, Bureau of Highway Operations, P. O. Box 7986, Room 501, Madison, WI 53707-7986.