Motorcycle Lane Splitting and Filtering Is Legal in Six States as More Consider It in 2026

For most American riders, threading a motorcycle between two lanes of traffic is still illegal, and doing it in the wrong state can mean a ticket. But the map is slowly changing. As of 2026, six states allow some form of riding between lanes, each with its own speed limits and conditions, and at least eight more are weighing bills of their own. For both riders and the drivers sharing the road with them, knowing the difference between lane splitting and lane filtering, and where each is allowed, can prevent a citation or a collision.

Lane Splitting Versus Lane Filtering

The two terms are often used interchangeably, but the law treats them differently. Lane splitting means a motorcycle riding between lanes of traffic that is moving, typically to make progress through slow highway congestion. Lane filtering is narrower: it means a motorcycle moving between lanes of stopped or very slow traffic, usually to advance to the front at a red light or in a jam, then settling back into a lane once traffic flows.

That distinction is the dividing line in state law. Only one state permits true lane splitting between moving vehicles. The other states that have acted allow the more limited practice of filtering, and they wrap it in strict conditions on speed and road type. Riders who assume that legal in one state means legal next door can find the rules are far tighter, or nonexistent, across the line.

The Six States Where It Is Legal

California is the original and the only state that allows full lane splitting between moving traffic. The practice was formally legalized under California Vehicle Code section 21658.1, enacted by Assembly Bill 51 in 2016, and the state’s safety agency publishes guidance encouraging riders to split at modest speed differentials rather than weaving through fast traffic.

The other five states permit lane filtering under specific limits. In Utah, filtering is allowed only between stopped vehicles on roads with a speed limit of 45 mph or less, and the rider may not exceed 15 mph; splitting moving traffic remains illegal. Arizona adopted a similar law under Senate Bill 1273, effective in September 2022, requiring that traffic be stopped, the road be 45 mph or under, and the rider stay below 15 mph. Montana is the most permissive of the filtering states, allowing it when surrounding traffic is moving at 10 mph or less and letting the rider travel up to 20 mph, which makes it the only state to clearly allow filtering in slow rolling traffic rather than only at a dead stop.

Colorado legalized lane filtering in August 2024, but with a twist: the law carries a sunset provision and is set to expire in September 2027 unless lawmakers renew it, while the state transportation department collects crash data to judge whether the policy is working. Minnesota’s filtering law took effect in July 2025 and includes a rider friendly feature, a provision that bars other drivers from intentionally blocking a motorcyclist who is filtering, similar to a protection in California law.

Where It Is Banned and Where It Could Spread

In the large majority of the country, riding between lanes is explicitly prohibited. Lane sharing is banned in roughly 35 states, including the most populous ones outside California, such as Texas, Florida, New York, Illinois, Georgia, North Carolina, and Pennsylvania. In those states a rider caught splitting or filtering faces a moving violation, points, and the insurance consequences that follow.

Momentum is building in other statehouses. Eight states have been actively considering filtering bills, including Connecticut, Maryland, Massachusetts, Missouri, Oregon, Texas, Virginia, and Washington. Supporters point to research suggesting that a motorcycle stopped in a line of traffic is vulnerable to being rear ended, and that allowing it to move to the front at a red light can reduce that risk and ease congestion. Opponents worry about driver surprise and enforcement. Because several of these proposals carry sunset clauses and data collection requirements like Colorado’s, the next few years will produce real crash evidence that could shape whether filtering spreads further.

What Riders and Drivers Should Do

For riders, the rule is to check the law in the specific state you are riding in, not the one you live in, and to respect the exact conditions. In a filtering state that means staying at or below the posted filtering speed, only moving between lanes when traffic is stopped or crawling, and returning to a single lane once traffic clears. Filtering at 30 mph in a state that caps it at 15 is still a ticket, and splitting moving traffic anywhere outside California is illegal. Riders crossing state lines on a summer trip should treat filtering as banned by default unless they have confirmed otherwise.

For drivers, the key is awareness in the states where filtering is legal. Check mirrors and blind spots before changing lanes or edging within a lane in slow traffic, since a motorcycle may legally be moving up between the lines. In California, Minnesota, and other states with anti blocking provisions, deliberately steering to obstruct a filtering rider can itself be a violation. Even where it remains illegal, expecting that a rider might move up in stopped traffic is simply safer than assuming the lane beside you is empty.

The broader picture is a slow, cautious expansion. A decade after California stood alone, five more states have opened the door to filtering under tight limits, and the data they are gathering will decide how far the practice travels next. Until the law catches up everywhere, the safest approach for everyone on the road is the same: riders should know the precise rule where their wheels are, and drivers should ride their mirrors as if a motorcycle could be there, because in a growing number of states it legally can.

What the Safety Research Shows

The debate over lane splitting is not just about convenience; it turns on a real safety question. A widely cited study by the University of California, Berkeley examined thousands of motorcycle collisions in California and found that riders who split lanes were doing so at relatively low speeds and modest speed differences over surrounding traffic in most cases, and that they were less likely to suffer head or torso injuries than riders who were rear ended sitting in stopped traffic. The findings suggested that filtering or splitting at low speed, with a small gap in speed between the bike and traffic, carries less risk than the rear end strikes that threaten a stationary rider.

That nuance explains why every state that has acted ties the practice to tight speed limits. The danger climbs sharply when a rider splits fast moving traffic or opens a large speed gap, because the time a driver has to react to a motorcycle appearing alongside shrinks. States such as Colorado and Minnesota paired their laws with crash data collection precisely so they can measure whether the real world results match the research before deciding to keep or expand the rules.

There are practical steps that lower the risk wherever filtering is legal. Riders are urged to wear high visibility gear and keep a headlight on so drivers notice them moving up between lanes, to filter only when the gap is clearly wide enough, and to be ready for a door or mirror to swing or a driver to change lanes without signaling. On the insurance side, a citation for illegal splitting in a state that bans it is a moving violation that can raise premiums, so the financial case for knowing the local rule is as strong as the safety case. As more states gather evidence, the patchwork is likely to keep shifting, and staying current on the law is part of riding responsibly.

Sources:

• The Advocates: Is Lane Filtering Legal? 2026 State-by-State Guide
• ConsumerShield: Lane Splitting and Filtering Laws by State 2026
• LegalClarity: Lane Filtering Laws by State
• RoadRunner: Lane Splitting or Filtering Is Legal in Six States