Wisconsin Statutes Vehicles (Ch. 340 to 351) § 346.31. Required position and method of turning at intersections

(1) Turns indicated by pavement markings. Where state or local authorities have placed pavement markings or signs within or adjacent to an intersection directing traffic turning at such intersection to follow a particular course, the operator of a vehicle turning at such intersection shall comply with such directions. In the absence of such pavement markings or signs, the operator of a vehicle intending to turn at an intersection shall do as provided in subs. (2) to (4).

(2) Right turns. Both the approach for a right turn and the right turn shall be made as closely as practicable to the right-hand edge or curb of the roadway. If, because of the size of the vehicle or the nature of the intersecting roadway, the turn cannot be made from the traffic lane next to the right-hand edge of the roadway, the turn shall be made with due regard for all other traffic.

(3) Left turns . Except as otherwise provided in sub. (4), left turns at intersections shall be made as follows:

(4) Left turns on 3-lane highways. On a 2-way highway having an uneven number of lanes the approach for a left turn or U-turn shall be made in the center lane, unless otherwise posted or marked. A left turn into a 2-way highway having an uneven number of lanes shall be made so as to enter the highway in the lane immediately to the right of the center lane.