Wyo. Stat. § 31-5-208: One-way roadways and rotary traffic islands.

(a) The superintendent and local authorities with respect to highways under their respective jurisdictions may designate any highway, roadway, part of a roadway or specific lanes upon which vehicular traffic shall proceed in one (1) direction at all or such times as is indicated by official traffic-control devices.

(b) Upon a roadway so designated for one-way traffic a vehicle shall be driven only in the direction designated at all or such times as indicated by official traffic-control devices.

(c) A vehicle passing around a rotary traffic island shall be driven only to the right of the island.