Motorcycles can drive between cars legally in only six U.S. states, and every one of them attaches conditions. California is the sole state that permits full lane splitting through moving traffic. Arizona, Colorado, Minnesota, Montana, and Utah allow the narrower maneuver called lane filtering, which is limited to stopped or barely moving traffic and capped at low speeds. In the other roughly 44 states, riding between lanes will get you a ticket, and if a crash follows, the violation can wreck your accident claim.
Splitting, Filtering, and Sharing Are Not the Same Thing
The legal answer depends on which maneuver you actually mean. Lane splitting is riding between rows of traffic that may be moving at highway speeds. Lane filtering is narrower: passing between vehicles that are stopped or nearly stopped, typically at a red light or in gridlock. Every state that has legalized this maneuver since California has picked the filtering model, not full splitting.
Lane sharing is a third thing entirely: two motorcycles riding side-by-side in the same lane. That one gets its own note at the end because most riders lump it in by mistake.
California Is the Only Full Lane-Splitting State
California’s vehicle code defines lane splitting as driving a two-wheeled motorcycle between rows of stopped or moving vehicles in the same lane, on any divided or undivided road or highway.1California Legislative Information. California Vehicle Code Section 21658.1 The statute sets no speed cap. Instead it directs the California Highway Patrol to publish safety guidelines.2California Highway Patrol. California Motorcyclist Safety Program
Those CHP guidelines recommend riding no more than 10 mph faster than surrounding traffic and avoiding the maneuver entirely once traffic is moving at 30 mph or above. The numbers are recommendations, not enforceable speed limits, but an officer who watches you split at 60 through 35 mph traffic has ample grounds for a reckless driving stop.
One detail catches people out: the statute specifies a motorcycle “that has two wheels in contact with the ground.” A three-wheeler or trike doesn’t qualify.1California Legislative Information. California Vehicle Code Section 21658.1
The Five States That Allow Lane Filtering
Each of the filtering states caps the rider’s speed, limits the maneuver to slow or stopped traffic, and generally restricts it to two-wheeled bikes. The specifics vary enough that a rider crossing state lines needs the actual numbers.
Arizona
Arizona lets a two-wheeled motorcyclist pass a stopped vehicle in the same lane, or ride between lanes, on roads with at least two lanes in the same direction and a posted limit of 45 mph or less. The rider cannot exceed 15 mph, and the vehicle being passed must be stopped.3Arizona Legislature. Arizona Code 28-903 – Operation of Motorcycle on Laned Roadway Exceptions
Colorado
Colorado authorizes a two-wheeled motorcycle to pass other vehicles in the same lane when traffic is at a complete stop. The motorcycle must stay at 15 mph or less, the lanes must be wide enough to pass safely, and the rider cannot pass on the right shoulder or to the right of the farthest right-hand lane on non-limited-access highways.4Colorado General Assembly. SB24-079 Motorcycle Lane Filtering and Passing
Minnesota
Minnesota’s law took effect July 1, 2025. A motorcyclist can pass within the same lane if two speed limits both hold: the motorcycle stays at or below 25 mph, and it goes no more than 15 mph faster than surrounding traffic.5Minnesota Office of the Revisor of Statutes. SF 3259 – 94th Legislature In practice, stopped traffic means you can filter at up to 15 mph. Traffic at 15 mph means you can go up to 25. Once cars are moving at 25 mph, you can’t legally pass at all.
Montana
Montana permits two-wheeled motorcycles to filter when surrounding traffic is stopped or moving at 10 mph or less. The rider cannot exceed 20 mph, the lanes must be wide enough to pass safely, and conditions must allow prudent operation.6Montana State Legislature. Montana Code 61-8-392 – Lane Filtering for Motorcycles Definition The 20 mph cap makes Montana the most generous of the filtering states.
Utah
Utah allows filtering on any road with a posted limit of 45 mph or less that has at least two lanes in the same direction, and on off-ramps. Vehicles being passed must be fully stopped, and the motorcycle cannot exceed 15 mph. Filtering is banned on on-ramps.7Utah Legislature. Utah Code 41-6a-704
What the Filtering States Have in Common
The specifics differ, but a few patterns hold across all five filtering states and give you a quick mental checklist.
- Two wheels only. Trikes and three-wheeled bikes are excluded from every filtering statute.
- Speed caps of 15 to 20 mph on the motorcycle itself. Most states set 15; Montana sets 20.
- Traffic must be stopped or crawling. Colorado, Arizona, and Utah require a full stop. Montana allows 10 mph and under. Minnesota keys off a differential rather than a hard number.
- The road must have at least two lanes going the same direction. A single lane each way doesn’t qualify.
- A safety catch-all applies. Every statute requires the maneuver to be doable safely, so bad weather, narrow lanes, or a wide vehicle next to you can make a technically legal filter functionally illegal if something goes wrong.
What You Get Ticketed With If You Do It Anyway
In the states that prohibit riding between cars, the standard citation is for an improper lane change or failure to stay within a single lane. First-offense fines usually run $100 to $350, depending on the local court schedule and surcharges. Many jurisdictions also add points to your license, and enough points over time can trigger a suspension.
Aggressive circumstances push the charge higher. Weaving between lanes at speed, cutting across multiple lanes of moving traffic, or splitting near a school zone can turn a simple infraction into reckless driving. That’s typically a misdemeanor, with fines of $500 or more, a possible suspension, and in some states a short jail term.
The filtering states enforce their own limits the same way. A Colorado rider who filters through slow-but-moving traffic, or a Utah rider who filters at 25 instead of 15, is breaking the law just as clearly as someone filtering in a state where it’s flatly banned.
How It Hurts You in a Crash
The ticket is the small problem. The bigger one is what illegal splitting does to your accident claim. In most states, breaking a traffic law at the moment of a collision counts as negligence per se, and a court will treat you as presumptively at fault. You don’t automatically lose, but you start well behind.
Most states then apply comparative fault, meaning a jury assigns each party a percentage of blame and reduces the damages accordingly. If you were illegally splitting when a driver changed lanes without signaling, a jury might land at 40% on you and 60% on the driver, and your recovery drops by your share. Under a modified comparative fault rule, crossing 50% responsibility bars recovery entirely.
Insurance adjusters know these numbers. A motorcyclist who was splitting at the time of an accident will almost always see the claim reduced or denied, even when the other driver did something plainly careless. Splitting gives the insurer a clean contributory negligence argument, and it tends to land. Even in California, exceeding the CHP’s recommended speed differential can shift fault toward the rider when things go wrong.
Lane Sharing Between Two Motorcycles Is a Separate Rule
Lane sharing means two motorcycles riding side-by-side within a single lane, not a motorcycle passing between separate lanes of cars. Most state vehicle codes grant a motorcycle the full use of a lane and allow two motorcycles to occupy that lane abreast. It’s legal in most states and has nothing to do with the splitting or filtering rules above.
What is prohibited essentially everywhere is a car and a motorcycle sharing a lane side-by-side. The motorcycle is entitled to the full width of the lane, and a car that crowds in is violating that right whether or not the state allows filtering.