Is Lane Splitting Legal in California? What Riders and Drivers Need to Know

Updated October 5, 2026

Originally published October 25, 2019

You’re crawling along the 5 at rush hour, and a motorcycle slides past between the lanes. Is that rider breaking the law? In California, no, lane splitting is legal. Vehicle Code section 21658.1 recognizes it, and the state has allowed it for decades. Legal does not mean risk-free, though, and plenty of riders and drivers get the details wrong.

This guide covers what the law says, what the safety research found, how riders and drivers should act around it, and what happens to your claim if you’re hurt in a crash while splitting lanes. If you’ve already been hurt, skip to the section on injury claims or call us at (619) 333-5555.

Is Lane Splitting Legal in California?

Yes. California is the state that first gave lane splitting a clear legal footing, and a rider here can legally ride between rows of stopped or moving vehicles in the same lane. The rule has been in the Vehicle Code since January 1, 2017, when Assembly Bill 51 added section 21658.1.

Two things the law does not do. It does not require anyone to split lanes, and it does not give a rider a free pass on every other traffic rule. You still have to ride at a safe speed, signal, and stay alert. A rider who splits lanes recklessly can be ticketed and can be held responsible for a crash.

What Is Lane Splitting?

Lane splitting means riding a motorcycle between two lanes of traffic, with the bike on or near the painted line, while the cars on either side are stopped or moving. Riders and drivers use several names for it, and they are not always interchangeable:

• Lane splitting: riding between lanes of traffic that is stopped or moving.
• Lane filtering: moving up between stopped cars, such as at a red light or in a dead-stop jam.
• Lane sharing: two motorcycles riding side by side or staggered in one lane. This is not lane splitting.
• Stripe-riding or white-lining: informal names for riding the lane line.

It does not matter whether the road has a divider. If the bike is between two lanes of traffic going the same direction, it counts. Weaving in and out of traffic at high speed is something else entirely, and that is where riders get cited.

What Does California Law Actually Say About Lane Splitting?

Section 21658.1 defines lane splitting as “driving a motorcycle that has two wheels in contact with the ground, between rows of stopped or moving vehicles in the same lane, including on both divided and undivided streets, roads, or highways.” It also lets the California Highway Patrol (CHP) develop educational guidelines for safe lane splitting, in consultation with the DMV, Caltrans, the Office of Traffic Safety, and a motorcycle safety organization.

The Speed Rule Most People Quote Is Not Law

You may have heard “no more than 10 mph faster than traffic, and never above 30 mph.” That came from early CHP guidelines. The CHP withdrew them after a complaint that they worked like regulations issued without the proper rulemaking process, and its updated guidance dropped the numbers. The statute never contained them.

What applies instead is the ordinary law. You must obey posted speed limits and the basic speed law, Vehicle Code 22350, which says you can’t drive faster than is safe for the traffic and road conditions. Lane splitting at a speed that is unsafe for the gap you’re in is a violation. Helmets are still required for every rider under Vehicle Code 27803.

The old numbers are still useful as a gut check. They just are not a legal safe harbor, and an insurance company can argue you were going too fast even if you stayed under them.

Is Lane Splitting Safe? What the Research Shows

The best California data comes from a 2015 UC Berkeley Safe Transportation Research and Education Center study for the state’s Office of Traffic Safety. It looked at 5,969 motorcyclists involved in collisions, and 997 of them (17%) were splitting lanes when they crashed. Compared to riders who were not splitting lanes:

Source: UC Berkeley SafeTREC, Motorcycle Lane-Splitting and Safety: 2015 Study, prepared for the California Office of Traffic Safety.

The speed findings matter just as much. Speed differences of up to 15 mph between the rider and surrounding traffic were not linked to more injuries. The researchers found no meaningful rise in injuries until traffic itself was moving faster than about 50 mph. Their conclusion: lane splitting looks relatively safe when traffic is moving 50 mph or slower and the rider is no more than 15 mph faster than the cars around them.

It is not all good news for riders. Lane-splitting riders were more likely to run into the back of another vehicle (38% vs. 16%), which fits what we hear about riders misjudging a closing gap. The study also only counted riders who crashed, so it can’t tell you how often splitting lanes prevents a crash in the first place.

How to Split Lanes More Safely: A Rider Checklist

Nobody has to split lanes. If a gap looks tight or traffic looks unpredictable, stay put. When you do split, these habits cut your risk:

• Keep the speed difference small. Stay within about 10 to 15 mph of the cars you’re passing, and skip it once traffic is moving at highway speed.
• Assume nobody sees you. Most drivers don’t check for a bike coming between lanes. Treat every car as if it’s about to move over.
• Watch the front wheels and the mirrors. A car turning its wheels or a driver glancing in the side mirror usually means a lane change is coming.
• Choose your lane line. The far-left lines are usually the safest, since there are fewer on-ramp and exit lane changes and you’re clear of most big trucks.
• Look for doors and mirrors. A door opening into your path leaves no time to react. Give extra room next to rideshare cars and taxis.
• Wear the gear. A DOT-compliant helmet is the law, and armored jacket, gloves, and boots matter far more than most riders think until the day they need them.
• Skip it in bad conditions. Rain, glare, and darkness make you harder to see and make a fall worse.

Riders also hear about the “four Rs”: be reasonable, responsible, respectful, and aware of the roadway. They are easy to remember because they are common sense.

What Drivers Need to Do Around Motorcycles

Drivers are half of this equation, and many crashes start with a driver who never looked. If you drive in California, you share the road with riders who are allowed to be between the lanes.

• Check your mirrors and your blind spot, twice, before every lane change.
• Signal early so a rider can see where you’re headed.
• Look behind you before opening your door in traffic. Opening a door into a moving rider is a violation of Vehicle Code 22517.
• Don’t block a rider on purpose, cut them off, or swerve at them. Doing it deliberately can bring a citation and civil liability.
• Check for oncoming motorcycles before turning left. A bike is smaller and farther away than it looks.
• Leave extra following distance behind a motorcycle. Bikes stop quickly, and their brake light is easy to miss.

Which Other States Allow Lane Splitting?

For years California stood alone. That has changed, and the list is still moving:

• Utah (2019): lane filtering past stopped traffic on roads with a speed limit of 45 mph or less, with updates in 2024.
• Montana (2021): passing stopped or slow traffic at up to 20 mph where the lane is wide enough.
• Arizona (2022): filtering up to 15 mph past fully stopped traffic on roads with a speed limit of 45 mph or less.
• Colorado (2024): passing stopped vehicles at 15 mph or less.
• Minnesota (July 1, 2025): splitting at no more than 25 mph and no more than 15 mph over traffic, and filtering at 15 mph or less.

Outside those states, riding between lanes can get you a ticket. Check local rules before you take a ride out of state.

What If You’re Hurt in a Motorcycle Crash While Lane Splitting?

Lane splitting is legal, and it does not erase your right to compensation. But after a crash, expect the other driver’s insurance company to bring it up first. A common move is to say the rider “caused” the crash by being between the lanes. That argument is weaker than adjusters make it sound.

How Fault Works in a California Lane-Splitting Crash

California follows pure comparative negligence. A jury or insurer can split fault between you and the driver, and your recovery is reduced by your share of the blame. If you’re found 20% at fault on a $200,000 claim, you can still recover $160,000. Being partly at fault does not bar a claim.

The facts decide the percentage. Was the driver changing lanes without checking? Did a door open? Was the rider going far faster than traffic? These are what we dig into on a lane-splitting case.

Evidence That Protects a Rider’s Claim

• Dashcam or helmet-cam video, if you have it, and nearby business or traffic camera footage (it gets overwritten fast).
• Photos of the vehicles, the lane lines, skid marks, and the damage to your gear and bike.
• Names and numbers of witnesses, especially other drivers who saw the lane change.
• The police report and your medical records from the first visit forward.
• Your bike’s and your gear’s condition. Don’t repair or throw anything away before it is documented.

Motorcycle crashes are rarely minor. In 2023, 583 motorcyclists were killed on California roads, about 14% of all traffic deaths in the state. Many who survive face broken bones, spinal injuries, road rash, and head trauma. For a closer look, read our guide to common motorcycle accident injuries and what a claim can be worth in our breakdown of the average motorcycle accident settlement in California.

Don’t Wait on the Deadline

You generally have two years from the crash to file a personal injury lawsuit in California. If a city, county, or other public entity is involved, such as a pothole or a city vehicle, you usually have only six months to present a claim. Evidence also fades, so earlier is better.

Why Riders Call Batta Fulkerson After a Motorcycle Crash

Insurance companies assume injured riders will take the first offer, partly because bikers get blamed by default. We see it differently. You were hurt, and if someone else’s carelessness caused it, you deserve full compensation. Batta Fulkerson has recovered nearly $250 million for injured clients with a 98% success rate, and San Diego has voted us its favorite personal injury firm. We’re open 24 hours, and you’ll talk to a real person on our team who knows your name.

Learn more about our San Diego motorcycle accident attorneys, and read what clients say on our client reviews page.

Hurt on your bike? Call (619) 333-5555 or use our free case review form. No fees unless we win.

Frequently Asked Questions About Lane Splitting in California

Is lane splitting legal in California?

Yes. California Vehicle Code section 21658.1 defines lane splitting and gives it legal recognition, and no California law bans a rider from riding between lanes of stopped or moving traffic. Riders still have to follow the speed limit and ride safely for the conditions.

What is the speed limit for lane splitting in California?

The law sets no special speed limit for lane splitting. The regular speed limit and the basic speed law apply, which means you can’t go faster than is safe for traffic and road conditions. The old CHP rule of thumb of 10 mph over traffic and no splitting above 30 mph was withdrawn, and the CHP’s current guidance leaves out speed numbers.

Is lane splitting safe?

A 2015 UC Berkeley study of 5,969 crash-involved California riders found that lane-splitting riders had fewer head injuries (9% vs. 17%), fewer torso injuries (19% vs. 29%), and fewer fatal injuries (1.2% vs. 3.0%). The researchers called it relatively safe when traffic is moving 50 mph or slower and the rider is no more than 15 mph faster than the cars around them.

Can I get a ticket for lane splitting in California?

Not for lane splitting itself. You can still be cited for speeding, an unsafe lane change, reckless driving, or any other violation that happens while you split lanes.

Who is at fault if a car hits a motorcycle that is lane splitting?

Fault depends on what each driver did. California uses pure comparative negligence, so a jury can divide blame between the rider and the driver, and your compensation is reduced by your share. Lane splitting alone does not make a rider at fault, and a driver who changes lanes without looking or opens a door into a rider can carry most or all of the blame.

How long do I have to file a motorcycle accident claim in California?

You generally have two years from the date of the crash to file a personal injury lawsuit. If a city, county, or other public agency is involved, a claim usually has to be presented within six months, so talk to an attorney as early as you can.

Is lane splitting legal in other states?

A handful of states allow some form of it. California permits true lane splitting, and Minnesota added a version in July 2025. Utah, Montana, Arizona, and Colorado allow lane filtering past stopped traffic under tight limits. Most other states do not allow either one, and the rules keep changing, so check before you ride out of state.