Yes — and the reason is not the one you have read
Lane splitting is legal in California. The California Highway Patrol says so in one sentence:
“Lane splitting is legal if done in a safe and prudent manner.”
What almost every article gets wrong is why. The usual version is that California legalised lane splitting in 2016. It did not. California defined it in 2016. It had never been prohibited in the first place, which is why riders had been doing it legally for decades before any statute mentioned it.
The distinction is not academic. It changes what the rules actually are, and it explains why there is no speed limit for it.
What the statute actually says, in full
California Vehicle Code section 21658.1 was added by Stats. 2016, Ch. 141, Sec. 1 (AB 51) and took effect on 1 January 2017. It is short, and it does three things:
- (a) It defines the term. “Lane splitting” means operating a motorcycle — with two wheels contacting the ground — between rows of stopped or moving vehicles in the same lane, on divided or undivided streets, roads, or highways.
- (b) It gives the CHP a role. The Highway Patrol may create educational guidelines for lane splitting, to ensure the safety of motorcyclists and of the drivers and passengers around them.
- (c) It says who must be consulted when those guidelines are developed: the Department of Motor Vehicles, the Department of Transportation, the Office of Traffic Safety, and a motorcycle safety organisation.
Now the three things it does not do, all of which are treated as fact somewhere on the internet:
- It contains no prohibition. Nothing in the section forbids anything.
- It contains no express authorisation either. It does not say lane splitting is permitted. It says what the words mean.
- It contains no speed figure of any kind. No mph limit, no differential over surrounding traffic, no cap.
That last point is the one worth carrying away, because riders repeat speed rules to each other as if they were law.
The speed limit that does not exist
You will be told that you may split at up to 15 mph faster than traffic, or that you may not split above 50 mph. Those numbers are not in the statute. The section quoted above is the whole of California’s lane splitting law and it contains no numbers at all.
What governs your speed instead is everything that governs it the rest of the time:
- The CHP’s standard — “safe and prudent manner”. A judgement, not a threshold.
- The basic speed law, which prohibits driving faster than is reasonable for conditions regardless of the posted limit.
- The posted limit itself.
- The ordinary offences — unsafe lane change, following too closely, reckless driving. Splitting does not suspend any of them.
Practically, that is a stricter regime than a number would be, not a looser one. A rider quoting a 15 mph differential to an officer is quoting something that is not in the vehicle code; the officer is applying “safe and prudent” and the basic speed law, and both are assessed after the fact.
The two-wheel requirement, which excludes more riders than you would expect
Read the definition again: a motorcycle “with two wheels contacting the ground”.
California’s general definition of a motorcycle is wider than that. CVC 400(a) defines one as a motor vehicle “that has a seat or saddle for the use of the rider, and is designed to travel on not more than three wheels in contact with the ground”, with a motor displacing more than 150cc. That includes trikes, reverse trikes and sidecar outfits.
But the lane splitting definition in 21658.1 does not. It is limited to two wheels on the ground. So a trike or a sidecar rider is riding a motorcycle under California law and is outside the statutory definition of lane splitting — which, given how much wider those machines are, is a sensible line to have drawn and one that almost nobody mentions.
Two more scope details in the same sentence that get overlooked:
- “stopped or moving vehicles” — the definition is not limited to stationary traffic. It covers filtering through a jam and passing between vehicles that are moving.
- “on divided or undivided streets, roads, or highways” — not just freeways. Surface streets are inside the definition.
Splitting, filtering, and why the words matter
The terms are used interchangeably in conversation and they describe different manoeuvres:
- Lane splitting — riding between rows of vehicles, including moving ones. This is what California’s statute defines.
- Lane filtering — moving between stopped vehicles at low speed, typically to the front of a queue at a signal. Several states that prohibit splitting have separately permitted filtering under tight conditions.
California’s definition is broad enough to cover both, since it includes stopped and moving vehicles. Other states are far narrower, and a rider who assumes California’s position travels is going to be wrong in most of the country. The state-by-state picture is in motorcycle lane splitting laws by state, and three states are covered in detail: Texas, Florida and Georgia — all three of which prohibit it.
Riding it sensibly, given that the standard is a judgement
Because the test is “safe and prudent” rather than a number, the way you ride is the whole of your legal position. The behaviours that make a manoeuvre look imprudent afterwards are the ones to avoid:
- Splitting at a large differential. The bigger the speed difference, the less time anyone has to react, and the harder “prudent” is to argue.
- Splitting between the wrong lanes. The gap between the two leftmost lanes is generally the widest and the most predictable.
- Splitting past large vehicles. Wide bodies, wide mirrors, huge blind spots.
- Splitting near junctions and exits. Where lane changes happen without warning.
- Splitting into a gap you cannot see out of. If a door could open or a car could drift, you need somewhere to go.
Being seen matters more here than anywhere else, and gear is part of that. What certifications actually mean is covered in motorcycle helmet ratings explained.
If you are new to California
Two things to sort before you rely on any of the above. The licence you hold has to cover the machine — California issues M1 and M2 classes and they are not interchangeable, which is covered in the California motorcycle licence. And the training route is its own programme rather than the national one: the California motorcycle safety course.
If you are still licensing, the general route is in how to get a motorcycle licence and motorcycle licence requirements, and the permit rules — which in California mean six months for under-21s — in motorcycle permit restrictions.
Frequently asked questions
Is lane splitting legal in California?
Yes. The California Highway Patrol states that “lane splitting is legal if done in a safe and prudent manner”. It has never been prohibited in California, and the 2016 statute that mentions it defines the term rather than legalising the practice.
What is the speed limit for lane splitting in California?
There is not one. California Vehicle Code 21658.1 contains no mph figure, no speed differential and no cap. What applies instead is the CHP’s “safe and prudent” standard, the basic speed law, the posted limit and the ordinary offences such as unsafe lane change and reckless driving.
What does California Vehicle Code 21658.1 actually say?
Three things. It defines lane splitting as operating a motorcycle with two wheels contacting the ground between rows of stopped or moving vehicles in the same lane, on divided or undivided streets, roads or highways. It permits the CHP to create educational guidelines. And it lists who must be consulted in developing them. It was added by AB 51 and took effect on 1 January 2017.
Can you lane split on a trike in California?
The statutory definition of lane splitting is limited to a motorcycle “with two wheels contacting the ground”, so a trike or a sidecar outfit falls outside it — even though California’s general definition of a motorcycle, in CVC 400(a), covers vehicles with up to three wheels.
Can you lane split on surface streets in California, or only freeways?
The definition covers “divided or undivided streets, roads, or highways”, so it is not limited to freeways. It also covers stopped and moving vehicles, so it is not limited to stationary traffic.
Is lane splitting legal in other states?
Mostly not, and California’s position does not travel. Texas, Florida and Georgia all prohibit it. Some states have separately permitted low-speed lane filtering under tightly defined conditions, which is a narrower manoeuvre than California’s definition covers.