Wyoming's primary keep-right rule is found in Wyoming Statutes §31-5-201.
On roadways of sufficient width, vehicles generally must be driven on the right half of the roadway unless a statutory exception applies.
A vehicle traveling at less than the normal speed of traffic at the time, place and under the conditions then existing must be driven in the right-hand lane available for traffic, or as close as practicable to the right-hand curb or edge of the roadway.
The slower-traffic rule does not apply when the driver is overtaking and passing another vehicle traveling in the same direction or when preparing for a left turn at an intersection or into an alley, private road or driveway.
Wyoming also requires a driver who moves left to pass another vehicle to return to an authorized lane of travel as soon as practicable after completing the pass.
Wyoming therefore follows the traditional slower-traffic keep-right model rather than a statewide rule making the left lane exclusively a passing lane on every multilane highway.
Exceptions
- Overtaking and passing another vehicle traveling in the same direction.
- Preparing for a lawful left turn at an intersection or into an alley, private road or driveway.
- Avoiding a stationary obstruction when moving left is necessary and safe.
- Traveling on certain three-lane roadways under applicable lane rules.
- Traveling on a roadway designated for one-way traffic.
- Using a properly designated high-occupancy vehicle lane.
Penalties
A violation of Wyoming's traffic laws is generally a misdemeanor when no more specific penalty applies.
For a first conviction, the general penalty is a fine of up to $200. A second conviction of the same offense within one year may carry a fine of up to $300. A third or subsequent conviction within one year may carry a fine of up to $500, imprisonment for up to six months, or both.
Official Source
Wyoming Statutes §31-5-201 - Driving on Right Side of Roadway; Exceptions
Last verified: October 11, 2026