Don’t be an A**hole, Get the F*ck Out of the Way
Know the rules. Share the road. Official state resources for keep-right and passing-lane rules, plus zipper merging.
Michigan
Keep Right / Passing Lanes
Zipper Merge
Sources reviewed October 19, 2026.
Rules vary by state and roadway. Statutes and agency guidance are labeled separately. Follow posted signs and read the linked official source.
More States
Colorado
Keep Right / Passing Lanes
Agency Guidance
Official explanation of Colorado’s passing-lane restrictions and exceptions.
Zipper Merge
Agency Guidance
Use both lanes to the defined merge point and alternate carefully into the open lane. Follow posted signs.
Illinois
Keep Right / Passing Lanes
Statute
Interstate and fully controlled-access freeway left-lane restrictions, with exceptions including congestion, hazards, and no vehicle directly behind.
Zipper Merge
Agency Guidance • PDF
Use both lanes, follow road signs, and take turns merging. This publication is guidance, not a stand-alone zipper-merge statute.
Maryland
Keep Right / Passing Lanes
Statute
Contains specific slower-vehicle keep-right requirements. The broader slower-than-general-traffic provision in subsection (b)(2) expressly provides guidance and does not permit a citation under that paragraph.
Safe Lane Changes
Statute • Safe Lane Changes
Change lanes only after determining it is safe and obey lane-control devices. This is a general lane-change law, not a zipper-merge mandate.
Minnesota
Keep Right / Passing Lanes
Statute
On multi-lane roads, move out of the left-most lane to let another vehicle pass when practicable. Exceptions include passing and preparing for a left turn or left exit.
Zipper Merge
Agency Guidance
In slow, backed-up work-zone traffic, use both lanes to the merge point and alternate. At highway speeds without backups, merge earlier when safe.
Missouri
Keep Right / Passing Lanes
Statute
On highways with two or more lanes in one direction, keep right except when passing, preparing for a proper left turn, or following traffic controls.
Zipper Merge
Agency Guidance
In heavy work-zone congestion, use both lanes to the merge point and take turns. When traffic moves freely at the speed limit, merge earlier.
Ohio
Keep Right / Passing Lanes
Statute
Traffic below the prevailing lawful speed keeps right, with exceptions for passing, left turns, and the intended route. Safety remains controlling.
Safe Lane Changes
Statute • Safe Lane Changes
Stay in your lane until a lane change can be made safely and obey lane-use controls. This is a general lane-change law, not a zipper-merge mandate.
Wisconsin
Keep Right / Passing Lanes
Agency Guidance
Explains the statutory keep-right rule for traffic below normal speed, with passing, turning, and move-over exceptions.
Zipper Merge
Agency Guidance
In backed-up lane closures, continue to the final merge point and alternate. At highway speeds without backups, move over earlier when safe.
Additional state sources reviewed October 23, 2026.
Zipper-merge guidance applies to appropriate lane closures; highway entrance ramps have separate yielding rules. Follow signs and merge safely.