Lane Splitting Laws: Where It's Legal and How to Do It Safely

Ask five riders whether lane splitting is legal and you'll get five confident answers, most of them wrong for at least one state. The confusion has a reason: lane splitting laws have changed more in the past decade than in the forty years before, and three different maneuvers often get lumped under one name. This guide sorts out the terms, maps where each is legal as of October 2026, and explains what the research and the permit test actually say.

Lane splitting vs filtering vs sharing

These three terms describe different things, and the law treats them differently.

So when someone asks "is lane splitting legal," the honest answer is often "splitting, no; filtering, maybe; sharing with another bike, usually yes." What's banned almost everywhere is a car squeezing into a lane alongside a motorcycle, or a motorcycle squeezing in beside a car outside the filtering or splitting rules.

Lane splitting laws by state

Here's where things stand. These are summaries; each law has extra conditions, so read your state's statute or rider manual before you try it.

Everywhere else, assume both splitting and filtering are illegal unless your state has passed a new law. Several states, including Washington and Oregon, have considered bills in recent sessions without enacting filtering. Hawaii briefly allowed riders to use the shoulder in designated areas, but that program expired.

Why some states allow filtering

The case for filtering is mostly about rear-end crashes. A motorcycle stopped at the back of a line of cars is exposed to the next driver who isn't paying attention. Filtering to the front puts the bike between cars, which can shield it from a distracted driver arriving behind.

Other arguments supporters make:

• Heat. Air-cooled engines and riders in full gear both suffer in stopped summer traffic.
• Congestion. Bikes moving to the front take up space that would otherwise be idle.
• Experience abroad. Filtering is common in much of Europe and Asia.

Opponents worry about drivers being surprised by bikes passing between them, drivers opening doors or changing lanes into a filtering rider, and riders pushing the limits on speed. That's why newer laws mostly allow filtering only at low speed and only in stopped traffic, rather than full California-style splitting.

Safety research

The most cited study is a 2015 report from UC Berkeley's Safe Transportation Research and Education Center (SafeTREC), which examined about 6,000 California motorcycle crashes, roughly 1,000 of them involving lane-splitting riders. Among its findings:

• Lane-splitting riders in crashes were less likely to suffer head injuries, torso injuries or fatal injuries than other riders in crashes.
• They were less likely to be rear-ended.
• Riding no more than about 15 mph faster than surrounding traffic was not associated with more frequent injuries; larger speed differences were linked to higher risk.

The study compared riders who crashed; it doesn't prove lane splitting prevents crashes in general. But it's the main reason newer laws cap the speed difference rather than banning the practice outright.

How to filter safely where legal

If you ride in a state that allows filtering, the rules are only the starting point. Good habits:

1. Keep it slow. Stay within your state's limit, and slower when gaps are tight.
2. Filter only in stopped traffic. When the light turns green, merge back into a lane promptly.
3. Watch for doors and lane changers. Look for turned wheels, gaps a driver might dart into, and passengers about to step out.
4. Avoid filtering next to large vehicles. Trucks and buses have bigger blind spots and less room.
5. Cover your brakes. Two fingers on the front lever, foot near the rear pedal.
6. Don't filter if you're still new. Slow-speed control between cars takes skill; build it first. Our motorcycle riding tips for beginners include drills for that control.

Permit holders should also check their own rules. Some states that allow filtering restrict riders on permits in other ways; see motorcycle permit restrictions for the common limits.

What the permit test says

State motorcycle manuals mostly reflect the law in that state, which means most of them tell you not to ride between lanes. Expect questions like these:

• Riding between rows of cars: In most states, the correct answer is that it's not permitted, and that cars and motorcycles each need a full lane width.
• Sharing a lane with a car: Wrong in every state. A motorcycle is entitled to the full lane.
• Two motorcycles side by side: Often allowed, but manuals typically advise a staggered formation for group riding instead.

In California and the newer filtering states, check the current manual, as questions may describe the state's specific rules. Our motorcycle permit test guide covers other common question types, and our free practice tests include lane position and group riding questions by state.

For broader motorcycle crash data, see NHTSA's motorcycle safety page.

Frequently asked questions

Is lane splitting legal in my state?

Full lane splitting in moving traffic is legal in California and Minnesota. Utah, Montana, Arizona and Colorado allow lower-speed filtering under conditions. In other states, assume it's illegal unless a new law has passed, and check your state's statute.

What is lane filtering?

Lane filtering is riding between lanes of stopped or nearly stopped traffic, typically to move to the front at a traffic light. States that allow it set low speed limits for the motorcycle.

Can two motorcycles ride side by side?

In most states, yes: two motorcycles may share a single lane. Many rider manuals still recommend a staggered formation for groups because it gives each rider more space.