(1) Upon all roadways of sufficient width the operator of a vehicle shall drive on the right half of the roadway and in the right-hand lane of a 3-lane highway, except:
(a) When making an approach for a left turn or U-turn under circumstances in which the rules relating to left turns or U-turns require driving on the left half of the roadway; or
(b) When overtaking and passing under circumstances in which the rules relating to overtaking and passing permit or require driving on the left half of the roadway; or
(c) When the right half of the roadway is closed to traffic while under construction or repair; or
(d) When overtaking and passing pedestrians, animals or obstructions on the right half of the roadway; or
(e) When driving in a particular lane in accordance with signs or pavement markings designating such lane for traffic moving in a particular direction or at designated speeds; or
(f) When the roadway has been designated and posted for one-way traffic, subject, however, to the rule stated in sub. (3) relative to slow moving vehicles.
(g) If the vehicle is a wide implement of husbandry, as defined in s. 347.24(3)(a) , being operated in compliance with any applicable requirement under s. 347.24(3) , 347.245(1) , or 347.25(2g) , and the vehicle is operated as much as practicable on the right half of the roadway and in the right-hand lane of a 3-lane highway, a portion of the vehicle may extend over the center of the roadway into any lane intended for travel in the opposite direction and may extend into any passing lane of a 3-lane highway. A wide implement of husbandry operated as described in this paragraph is subject to any restriction under ss. 346.06 , 346.09(2) and (3) , and 346.59 .
(1m) Notwithstanding sub. (1), any person operating a bicycle or electric personal assistive mobility device may ride on the shoulder of a highway unless such riding is prohibited by the authority in charge of the maintenance of the highway.
(2) The operator of a vehicle actually engaged in constructing or maintaining the highway may operate on the left-hand side of the highway; however, whenever such operation takes place during the hours of darkness the vehicle shall be lighted as required by s. 347.23 .
(3) Any vehicle proceeding upon a roadway at less than the normal speed of traffic at the time and place and under the conditions then existing shall be driven in the right-hand lane then available for traffic, or as close as practicable to the right-hand edge or curb of the roadway, except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn or U-turn at an intersection or a left turn into a private road or driveway, and except as provided in s. 346.072 .
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