Wyo. Stat. § 31-5-201 (2026)

(a) Upon all roadways of sufficient width a vehicle shall
be driven upon the right half of the roadway, except for any of
the following:

          (i) When overtaking and passing another vehicle
proceeding in the same direction under the rules governing the
movement;

          (ii) When a stationary obstruction exists making it
necessary to drive to the left of the center of the highway but
any person so doing shall yield the right-of-way to all vehicles
traveling in the proper direction upon the unobstructed portion
of the highway within such distance as to constitute an
immediate hazard;

          (iii) Upon a roadway divided into three (3) marked
lanes for traffic under the rules applicable thereon;

          (iv) Upon a roadway designated and signposted for
one-way traffic;

          (v) Upon a roadway designated and signposted as a
high occupancy vehicle lane.

     (b) Upon all roadways except one-way streets any vehicle
proceeding 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 curb or edge of the roadway,
except when overtaking and passing another vehicle proceeding in
the same direction or when preparing for a left turn at an
intersection or into an alley, private road or driveway.

     (c) Upon any roadway having four (4) or more lanes for
moving traffic and providing for two-way movement of traffic, no
vehicle shall be driven to the left of the center line of the
roadway except when authorized by official traffic-control
devices designating certain lanes to the left side of the center
of the roadway for use by traffic not otherwise permitted to use
the lanes, or except as permitted under paragraph (a)(ii) of
this section. This subsection does not prohibit the crossing of
the center line in making a left turn into or from an alley,
private road or driveway.