California lane splitting guidelines come from two places: Vehicle Code Section 21658.1, which makes the practice legal, and a set of educational safety tips published by the California Highway Patrol. The tips are principles rather than numbers. They focus on keeping your speed close to surrounding traffic, choosing the safer lanes to split between, staying visible, and avoiding large vehicles. There is no official speed cap in the current guidelines.
What the Law Says
CVC 21658.1 defines lane splitting as riding a two-wheeled motorcycle between rows of stopped or moving vehicles traveling in the same direction, on any divided or undivided street, road, or highway.1California Legislative Information. California Vehicle Code 21658.1 The statute does two things. It confirms that lane splitting is a lawful maneuver, and it authorizes the CHP to develop safety guidelines in consultation with the DMV, Caltrans, and road-safety organizations.2California Legislative Information. California Vehicle Code 21658.1
What the statute does not do is grant an unconditional right to ride between lanes however you want. The CHP guidelines themselves are educational, not regulatory, so breaking one of them doesn’t on its own produce a ticket. But a rider who splits dangerously can still be cited under California’s general traffic laws, and that distinction matters when you read the tips below.
The CHP Safety Tips for Riders
The CHP publishes its lane-splitting tips on its motorcyclist safety page. The tips are deliberately general. There is no single speed cap or numeric threshold in the current version. Instead, the agency frames the practice around two underlying ideas: the danger grows as the speed difference between you and surrounding traffic grows, and the danger grows as overall speed grows.3California Highway Patrol. California Motorcyclist Safety
Working from those principles, the CHP tells riders to:
- Evaluate the whole environment before splitting: lane width, the size of the vehicles around you, road surface, weather, and lighting.
- Split between the far-left lanes when possible. The CHP identifies this as typically safer than splitting between other lanes.
- Avoid splitting next to large vehicles like big rigs, buses, and motorhomes, which carry bigger blind spots and move more air around them.
- Stay visible. Don’t linger in blind spots or hang between vehicles, and use bright or reflective gear and daytime high beams to help drivers see you.
- Stay off the shoulder. Riding on the shoulder is not lane splitting, and it is illegal.
What Happened to the 10 and 30 MPH Rule
Riders researching this often arrive expecting to find the “no more than 10 mph faster than traffic, and never above 30 mph overall” rule. Those numbers came from an earlier version of the CHP guidelines developed around 2013 with UC Berkeley researchers. The CHP has since replaced those specific thresholds with the broader safety principles above. The old numbers remain sensible practical advice, but they are not currently published as official CHP recommendations.
What the Guidelines Tell Drivers
The CHP also publishes guidance aimed at drivers of cars and trucks, and some of it carries legal weight:
- Intentionally blocking or impeding a lane-splitting motorcyclist in a way that could cause harm is illegal.
- Opening a vehicle door to impede a motorcyclist is illegal.
- Drivers in the far-left lane should move toward the left side of their lane to give riders more room to pass on the right.
The agency also reminds every motorist to check mirrors and blind spots before changing lanes, signal clearly, and stay alert for motorcycles.3California Highway Patrol. California Motorcyclist Safety
Where and When Not to Split
Some situations make lane splitting much more dangerous, and one of them is outright illegal on its own. The shoulder is not a traffic lane, so riding there is a separate violation no matter how backed up traffic is.3California Highway Patrol. California Motorcyclist Safety
Other high-risk scenarios flagged by the CHP and experienced riders:
- Near freeway on-ramps and off-ramps, where merging drivers are focused on gaps and speed changes rather than motorcycles threading between lanes.
- Between the far-left lane and the center divider, where you lose your escape path on one side and debris tends to collect.
- Alongside buses, big rigs, and RVs, which have wide blind spots and generate enough wind to push a motorcycle sideways.
- In rain or on narrow lanes, where tire grip, visibility, and your margin for error all shrink.
None of these situations has a special lane-splitting penalty attached. If an officer thinks what you’re doing is unsafe, the citation comes from a general traffic statute.
How Unsafe Lane Splitting Gets Cited
CVC 21658.1 contains no penalty provision of its own, so there is no ticket labeled “bad lane splitting.” The two statutes most commonly used instead are the Basic Speed Law, CVC 22350, which prohibits driving faster than is reasonable for the road, traffic, weather, and visibility conditions,4California Legislative Information. California Vehicle Code 22350 and CVC 21658, which requires vehicles to stay within a single lane until they can move out of it safely.5California Legislative Information. California Vehicle Code 21658 Both are infractions and both add a point to your driving record.
When the behavior is severe enough, the charge can escalate to reckless driving under CVC 23103, a misdemeanor that carries jail time of five to 90 days, a fine up to $1,000, or both, along with two points on your record.6Justia. CALCRIM No. 2200 – Vehicle Offenses The CHP guidelines also function as a reference point in crash investigations and civil lawsuits, so a rider who was splitting consistently with the published tips is in a stronger position than one who wasn’t.
One Boundary Worth Knowing
California remains the only state where lane splitting through moving traffic is legal at any speed. Several other states permit a narrower practice called lane filtering, which generally allows a rider to pass between vehicles only when traffic is stopped or nearly stopped and only below a set speed. States with some form of lane filtering as of mid-2025 include Utah, Montana, Arizona, Colorado, and Minnesota, each with its own limits. In any state without such a law, riding between lanes is illegal and will draw a citation. If you ride outside California, check the local rules before you assume these guidelines travel with you.