No — and Missouri does it without a motorcycle law
Lane splitting is not permitted in Missouri, and neither is filtering past stopped traffic. What is interesting about Missouri is how the state gets there, because it is not the way most people assume.
Several states prohibit this in a statute written specifically about motorcycles. Washington’s RCW 46.61.608 says no person shall operate a motorcycle between lanes of traffic. Arizona’s 28-903 says the same and then carves out an exception. Colorado’s 42-4-1503 does likewise.
Missouri has no equivalent. Read RSMo 304.015, the section governing which part of the road a vehicle uses, and there is no mention of motorcycles at all — no full-lane entitlement, no ban on riding between lanes, no two-abreast rule, and certainly no filtering exception. The section is about driving on the right half of the roadway and the four situations in which you may leave it: overtaking under the rules governing that movement, positioning for a left turn, a right half closed for construction, and one-way streets.
Missouri prohibits lane splitting the way New Jersey does — by omission, through general rules that were never written with a motorcycle in mind.
The standard that does the work: the highest degree of care
Here is the provision that matters, and it is one of the more demanding sentences in any American traffic code.
RSMo 304.012: “Every person operating a motor vehicle on the roads and highways of this state shall drive the vehicle in a careful and prudent manner and at a rate of speed so as not to endanger the property of another or the life or limb of any person and shall exercise the highest degree of care.”
Most states hold drivers to reasonable care — what an ordinarily prudent person would do. Missouri asks for the highest degree of care, and it applies that standard to every driver on every road.
Set a discretionary maneuver against that. Moving between two columns of vehicles, into a space not designed as a lane, where drivers are not expecting a vehicle, is difficult to defend as the highest degree of care available to you in that moment — because a plainly available alternative was to stay in the lane. That is the legal shape of the problem in Missouri, and it is why the answer does not depend on finding a statute with “lane splitting” written in it.
What that means in practice
The citation will not say lane splitting. There is no such offense in Missouri. Expect careless and imprudent driving, an improper lane use or passing violation, or failure to exercise the highest degree of care, depending on what the officer saw.
There are no conditions to satisfy. The five states that permit filtering all attach numbers — a road speed limit, a rider speed cap, a requirement that traffic be stopped. Missouri has none of that, because it never wrote the permission. No speed makes this lawful and no traffic condition unlocks it.
Fault arguments get harder, not easier. In a collision, the standard a Missouri rider is measured against is the highest degree of care. A maneuver that was optional and unexpected is a poor place to be standing when that test is applied.
Three ways a state can say no, and Missouri uses the third
Once you have read a few of these statutes side by side, the fifty states sort into three groups. Knowing which group you are in tells you what to expect from an officer, from a court and from any campaign to change the law.
| Mechanism | What the code contains | Examples |
|---|---|---|
| Motorcycle statute with an exception | A section dedicated to motorcycles that bans riding between lanes, followed by a carve-out with numbers attached | Arizona, Colorado |
| Motorcycle statute without an exception | The same dedicated section, banning it outright, with nothing carved out | Washington |
| No motorcycle statute at all | General lane discipline and duty-of-care rules doing the work | Missouri, New Jersey |
The third group is the least predictable to ride in, because there is no line drawn anywhere. In Arizona a rider knows precisely what makes the maneuver lawful: two-wheeled machine, stopped traffic, 45 mph road, 15 mph rider. In Washington a rider knows it is never lawful, from one sentence. In Missouri there is nothing to read at all — only a standard of care applied after the fact, by someone who was not there.
It also explains why nothing changes quickly here. The five states that legalized filtering each amended a section that already existed. Missouri would have to write one.
One thing municipalities cannot do, and one they can
A detail worth knowing if you ride between St Louis, Kansas City and the towns in between.
Missouri expressly bars local rule-making on one motorcycle question: under RSMo 302.020.2, “no political subdivision of this state shall impose a protective headgear requirement on the operator or passenger of a motorcycle or motortricycle.” Cities cannot write their own helmet ordinances.
No equivalent bar exists for lane use. Ordinary municipal traffic regulation applies, and RSMo 304.015 itself contemplates local ordinances for one-way streets and parking. So the helmet rule is uniform statewide while the traffic environment around you is not.
Missouri’s helmet position, briefly
Since 2020, a qualified operator aged 26 or over may ride without protective headgear provided they maintain proof of financial responsibility and are covered by health insurance or other insurance providing medical benefits for motorcycle injuries. Riders and passengers under 26 must wear one, as must anyone riding on an instruction permit whatever their age.
Full detail, including the twenty-five dollar cap on the fine and the rule against being stopped to check, is in motorcycle helmet law Missouri. The licensing rules, including the permit you are allowed to ride unaccompanied, are in motorcycle license Missouri.
Where it is legal, and how far you would have to go
Five states permit a version of this, and none of them borders Missouri. Utah legalized filtering in 2019, Montana in 2021, Arizona in 2022, Colorado in 2024 and Minnesota in 2025 — the nearest of those being Colorado, and its authorization is written to repeal itself on 1 September 2027.
All five, with their different speed caps and traffic conditions, are compared in lane filtering. Colorado’s version, which authorizes passing in the same lane rather than between lanes, is unpicked in is lane splitting legal in Colorado. Every other state is in the state-by-state lane splitting map.
For neighbours specifically: Illinois and Kansas both prohibit it, as does Tennessee to the south-east. Illinois is also one of only three states with no helmet law at all, which makes the drive across the Mississippi a study in how much can change at one bridge — see which states require a helmet and is lane splitting legal in Illinois.
Frequently asked questions
Is lane splitting legal in Missouri?
No. Missouri has no motorcycle-specific lane statute, but riding between columns of traffic runs against the general lane rules in RSMo 304.015 and against the duty in RSMo 304.012 to exercise the highest degree of care.
Is lane filtering legal in Missouri?
No. Because the prohibition arises from general rules rather than a motorcycle statute, Missouri draws no distinction between filtering past stopped traffic and splitting past moving traffic. Neither is permitted.
What is the highest degree of care in Missouri?
It is the standard RSMo 304.012 applies to every driver: to drive in a careful and prudent manner, at a speed that does not endanger property or life or limb, and to exercise the highest degree of care. It is a more demanding test than the ordinary reasonable-care standard used in most states.
What would I be cited for in Missouri?
Not lane splitting — no such offense exists. Depending on what was observed, a careless and imprudent driving charge, an improper lane use or passing violation, or a failure to exercise the highest degree of care.
Can a Missouri city ban lane splitting or require helmets?
Missouri expressly forbids any political subdivision from imposing a helmet requirement on a motorcycle operator or passenger. There is no equivalent bar on ordinary municipal traffic regulation.
Which state near Missouri allows lane filtering?
None bordering it. The nearest is Colorado, which authorized same-lane passing in 2024 under conditions, and whose authorization is written to repeal itself on 1 September 2027.