Lane splitting, the practice of riding a motorcycle between lanes of slow-moving or stopped traffic, remains illegal in most of the United States despite being common in many other countries. If you ride a motorcycle or are considering taking up riding, understanding where this maneuver is permitted can help you stay legal and make informed decisions about your riding style and safety.
This guide explains which states allow lane splitting, how the laws differ, what other states are considering, and what you need to know about safety and enforcement.
Which States Currently Allow Lane Splitting?
As of now, California is the only state where lane splitting is explicitly legal. The practice was officially recognized and regulated under California Assembly Bill 51, which took effect in 2017, giving the California Highway Patrol authority to develop safety guidelines for the maneuver.
How California’s Lane Splitting Law Works
California law permits motorcyclists to ride between lanes of traffic moving in the same direction, but it does not grant unlimited freedom to split lanes at any speed or under any conditions. The California Highway Patrol recommends that riders only lane split when traffic is moving at 30 mph or slower and that motorcyclists travel no more than 10 mph faster than surrounding traffic.
These are guidelines, not legal requirements, meaning officers use discretion when determining whether a rider is operating safely. Riders who split lanes recklessly or at excessive speeds can still be cited for unsafe operation, and liability in a crash may shift based on whether the rider was following recommended practices.
Safety Guidelines for California Riders
The California Highway Patrol advises riders to avoid lane splitting in poor weather, low visibility, or when traffic speeds are unpredictable. Wearing high-visibility gear, using headlights, and staying alert to sudden lane changes by drivers are also recommended.
Lane splitting is safest in the leftmost lanes where traffic is most predictable and drivers are more likely to expect motorcycles. Avoid splitting near large trucks, buses, or recreational vehicles that have larger blind spots and limited maneuverability.
States Where Lane Filtering Is Legal
Several states have legalized a more limited practice called lane filtering, which allows motorcycles to move between stopped vehicles under specific conditions. This is different from lane splitting because it typically applies only when traffic is completely stopped, at lower speeds, and sometimes only at intersections.
Montana
Montana permits lane filtering under specific conditions defined in state law. Motorcyclists may filter between lanes when traffic is stopped and may not exceed 20 mph while doing so.
The law also requires that the posted speed limit be 20 mph or less, or that traffic be stopped due to congestion. This narrow definition makes Montana’s law more restrictive than California’s broader lane splitting allowance.
Utah
Utah legalized lane filtering in 2019, allowing motorcyclists to pass between stopped vehicles on roads with speed limits of 45 mph or less. Riders must not exceed 15 mph while filtering and may only do so when traffic is completely stopped.
Utah’s law also requires that the rider exercise due care and prudence, meaning reckless filtering can still result in citations. The statute was designed to reduce rear-end collisions involving motorcycles at intersections, a common cause of rider injuries.
Arizona
Arizona enacted a lane filtering law in 2022 that permits the practice on roads with speed limits at or below 45 mph. Motorcyclists may filter between vehicles only when traffic is stopped and must not exceed 15 mph.
The law specifically prohibits filtering between lanes of moving traffic, making it distinct from California’s approach. Riders must also ensure they have adequate space and cannot force other vehicles to change position.
Hawaii
Hawaii allows a limited form of lane filtering, though the law is more restrictive than those in Utah and Arizona. Motorcycles may pass stopped vehicles on roads with at least two lanes traveling in the same direction, but only under very specific safety conditions.
Riders must proceed with caution and may not exceed the speed of surrounding traffic by more than a modest margin. Because Hawaii’s law lacks the detailed regulatory framework found in other states, enforcement and interpretation can vary.
States Considering Lane Splitting or Filtering Legislation
Multiple states have introduced bills to legalize or study lane splitting and lane filtering in recent years, though most have not yet passed. These legislative efforts reflect growing interest in motorcycle safety and traffic congestion relief, but also face opposition from some driver advocacy groups and insurance organizations.
Oregon
Oregon has seen multiple lane splitting bills introduced in its legislature, with varying levels of support. Proposed measures have typically focused on allowing filtering at low speeds in stopped traffic, similar to Utah and Arizona models.
No Oregon bill has yet become law, but ongoing discussion suggests the state may eventually adopt some form of filtering. Riders in Oregon should verify current law before attempting to filter, as the practice remains illegal until legislation passes.
Washington
Washington State has also considered lane filtering legislation, with bills proposing to allow motorcycles to pass stopped traffic under controlled conditions. Public hearings have revealed divided opinions, with some law enforcement agencies supporting the safety benefits and others expressing concerns about enforcement and driver awareness.
As with Oregon, no law has been enacted, and riders must treat lane splitting and filtering as illegal until the legal status changes. Check with the Washington State Department of Licensing for current regulations.
Other States With Recent Proposals
Texas, Maryland, Connecticut, and several other states have introduced lane splitting or filtering bills in recent legislative sessions. Most proposals have focused on filtering rather than full lane splitting, reflecting concerns about safety and public acceptance.
Because legislative activity changes frequently, riders interested in the status of lane splitting in their state should consult their state’s legislative website or motorcycle advocacy organizations for updates. Laws that fail in one session are often reintroduced with modifications in subsequent years.
Why Most States Prohibit Lane Splitting
The majority of U.S. states have no specific laws addressing lane splitting, which means it falls under general prohibitions against unsafe driving or improper lane use. In these states, officers may cite riders for reckless driving, improper passing, or failure to maintain a single lane.
Opposition to lane splitting often centers on concerns that drivers are not accustomed to motorcycles moving between lanes and may not check mirrors or blind spots adequately. Some research from other countries suggests lane splitting can reduce congestion and lower certain crash risks, but U.S. driver training and road design have not historically accommodated the practice.
Safety Considerations When Lane Splitting or Filtering
Even where lane splitting is legal, it carries risks that riders must manage carefully. Drivers may change lanes suddenly without signaling, open doors in slow traffic, or fail to see a motorcycle approaching from behind.
Never assume drivers see you or expect you to be lane splitting, even in California where the practice is common. Maintain escape routes, watch for turn signals and wheel movement, and be prepared to stop quickly if a gap closes.
Visibility and Positioning
Use your headlight at all times and wear brightly colored or reflective gear to increase your visibility. Position yourself where you can see ahead and where drivers are most likely to check their mirrors.
Avoid lingering in blind spots, and do not split lanes directly beside large vehicles that may drift or have limited visibility. The space between the first and second lanes from the left is typically safest because drivers in those lanes are more likely to use mirrors and expect passing traffic.
Speed Differential
Keep your speed close to that of surrounding traffic to give yourself and drivers more reaction time. A common recommendation, even outside California’s guidelines, is to avoid traveling more than 10 to 15 mph faster than adjacent vehicles.
Higher speed differentials reduce the time available to react to sudden lane changes, door openings, or debris. They also increase the severity of any collision that does occur.
Road and Weather Conditions
Lane splitting becomes significantly more dangerous in rain, fog, or other conditions that reduce visibility and traction. Wet pavement also increases stopping distances and makes abrupt maneuvers riskier.
Avoid lane splitting at night unless lighting is excellent and traffic is predictable. Gravel, oil, or road debris that accumulates between lanes can cause loss of control, so scan the pavement ahead continuously.
Insurance and Liability Implications
If you are involved in a crash while lane splitting, liability will depend on whether the practice is legal in your state, whether you were following recommended guidelines, and the actions of other drivers involved. In states where lane splitting is illegal, you may be found partially or fully at fault even if another driver also acted negligently.
In California and states with legal lane filtering, insurance companies and courts will evaluate whether you were splitting or filtering reasonably and safely. Excessive speed, aggressive riding, or filtering under prohibited conditions can shift liability toward the motorcyclist.
Check with your insurance provider to understand how lane splitting affects your coverage. Some policies may have specific exclusions or conditions related to the practice, and requirements vary by insurer and state.
What To Do If You Receive a Citation
If you are cited for lane splitting or filtering in a state where it is prohibited, consult your state’s traffic laws and consider speaking with an attorney who specializes in traffic or motorcycle law. Penalties can range from fines to points on your license, and repeated violations may affect your insurance rates or riding privileges.
In states where the practice is legal but you are cited for unsafe operation, you may have options to contest the citation if you believe you were riding within legal and safety guidelines. Documentation such as helmet camera footage, witness statements, or traffic conditions can be relevant.
Advocacy and Future Changes
Motorcycle advocacy organizations such as the American Motorcyclist Association and state-level groups actively work to promote lane splitting and filtering legislation. These groups argue that allowing motorcycles to move through congested traffic reduces their exposure to rear-end collisions, decreases overall congestion, and improves traffic flow.
If you support changes to lane splitting laws in your state, consider contacting your state legislators, participating in public hearings, and joining advocacy groups. Legislative change often depends on sustained public engagement and evidence-based arguments about safety and traffic efficiency.
Verifying Current Law Before You Ride
Laws governing lane splitting and filtering can change as new legislation is enacted or court rulings are issued. Before you ride in an unfamiliar state or if you have not checked recently, verify the current legal status with your state’s department of motor vehicles, transportation department, or motorcycle safety office.
Do not rely on outdated information or assumptions based on other states’ laws. What is legal in California or Utah may result in a citation in neighboring states, and enforcement practices can vary even within a single state.
Understanding where lane splitting is legal helps you ride safely, avoid citations, and make informed decisions about your riding style. California remains the only state with full lane splitting legalization, while Montana, Utah, Arizona, and Hawaii permit more limited lane filtering under specific conditions. Because laws and proposals continue to evolve, stay current with your state’s regulations and always prioritize safety, visibility, and awareness of surrounding traffic.
For more guidance on motorcycle safety, vehicle laws, and ownership decisions, explore additional helpful articles on our Autos and Vehicles site.