Michigan's primary keep-right rule is found in Michigan Compiled Laws §257.634.
On a roadway with two or more lanes available for travel in the same direction, a driver generally must operate in the extreme right-hand lane available for travel unless an exception in the statute applies.
The law allows use of another lane when traffic is moving in substantially continuous lanes, when necessary for a reasonable distance before making a left turn, or in situations involving streetcar traffic.
Michigan treats freeways with three or more lanes in the same direction differently. Passenger vehicles traveling in the proper direction may generally use any lawful lane on those freeways.
However, trucks with a gross weight of more than 10,000 pounds, truck tractors, and certain vehicle-and-trailer combinations generally must use one of the two lanes farthest to the right on those freeways, except when preparing for a left turn or when a special hazard requires use of another lane for safety.
Michigan's passing law also requires a driver overtaking another vehicle to pass safely on the left and, once safely clear, return as near as practicable to the right-hand edge of the traveled portion of the highway.
Exceptions
- Traffic is moving in substantially continuous lanes.
- Preparing for a lawful left turn.
- Avoiding interference with streetcar traffic where applicable.
- Traveling in any lawful lane on a freeway with three or more lanes in the same direction, for vehicles not subject to the heavy-truck restriction.
- Using another lane when a special hazard makes it necessary for safety.
Penalties
A violation of Michigan's keep-right rule under §257.634 is a civil infraction.
Violations of the related passing rules in §§257.636 and 257.637 are also civil infractions.
The exact amount due may include the civil fine, court costs and other assessments, so drivers should verify the amount shown on the citation or with the court handling the case.
Official Source
Michigan Compiled Laws §§257.634 and 257.636 - Keep Right and Passing Rules
Last verified: October 10, 2026