Wisconsin Code § 346.09

Limitations on overtaking on left or driving on left side of roadway
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(1) Upon any roadway where traffic is
permitted to move in both directions simultaneously, the operator
of a vehicle shall not drive to the left side of the center of the
roadway in overtaking and passing another vehicle proceeding in
the same direction unless such left side is clearly visible and is
free of oncoming traffic for a sufficient distance ahead to permit
such overtaking and passing to be done in safety. In no case when
overtaking and passing on a roadway divided into 4 or more
clearly indicated lanes shall the operator of a vehicle drive to the
left of the pavement marking indicating allocation of lanes to vehicles moving in the opposite direction or, in the absence of such
pavement marking, to the left of the center of the roadway. Except as provided in sub. (3) (b) and s. 346.05 (1) (g), in no case
shall the operator of a vehicle drive in a lane when signs or signals
indicate that such lane is allocated exclusively to vehicles moving
in the opposite direction.
(2) Upon any roadway where traffic is permitted to move in
both directions simultaneously, the operator of a vehicle shall not
drive on the left side of the center of the roadway upon any part of
a grade or upon a curve in the roadway where the operator’s view
is obstructed for such a distance as to create a hazard in the event
another vehicle might approach from the opposite direction.
(3) (a) Except as provided in par. (b), the operator of a vehicle shall not drive on the left side of the center of a roadway on
any portion thereof which has been designated a no-passing zone,
either by signs or by a yellow unbroken line on the pavement on
the right-hand side of and adjacent to the center line of the roadway, provided such signs or lines would be clearly visible to an ordinarily observant person.
(b) The operator of a vehicle may drive on the left side of the
center of a roadway on any portion thereof which has been designated a no-passing zone, as described in par. (a), to overtake and
pass, with care, any vehicle, except an implement of husbandry or
agricultural commercial motor vehicle, traveling at a speed less
than half of the applicable speed limit at the place of passing.
(4) Other provisions of this section notwithstanding, the operator of a vehicle may not overtake and pass on the left any other
vehicle which, by means of signals as required by s. 346.34 (1),
indicates its intention to make a left turn or U-turn.

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