Lane splitting is not legal in Massachusetts. State law directly prohibits motorcyclists from passing another motor vehicle within the same lane, and the ban applies whether traffic is crawling, stopped at a light, or moving at highway speed. Riders caught doing it face a traffic citation at minimum, and a criminal reckless driving charge in more serious cases.
What the Statute Says
Chapter 89, Section 4A of the Massachusetts General Laws is the controlling provision. It states that motorcycle operators “shall not pass any other motor vehicle within the same lane, except another motorcycle.”1General Court of Massachusetts. Massachusetts General Laws Chapter 89 Section 4A Riding between rows of cars in the same lane to get ahead of them is exactly the behavior this language prohibits.
The same section requires motorcyclists to ride single file when passing and limits them to riding alongside no more than one other motorcycle. The statute contains no exception for stopped traffic, congested highways, or on-ramps.
Lane Splitting and Lane Filtering Are Both Banned
The two terms get used interchangeably, but they describe different behaviors. Lane splitting means riding between lanes of traffic that are moving in the same direction, usually during slow highway congestion. Lane filtering is narrower: moving between vehicles that are completely stopped, typically at a red light, to reach the front of the queue.
Several states that have recently loosened their rules legalized only filtering while keeping splitting illegal. Massachusetts draws no such line. Section 4A prohibits passing within the same lane regardless of whether the surrounding cars are moving or stopped.1General Court of Massachusetts. Massachusetts General Laws Chapter 89 Section 4A Filtering up to the front of a red light is just as illegal here as splitting on I-93.
Penalties for Lane Splitting
Enforcement falls into two very different categories, and which one you get depends largely on how the officer views your riding.
Civil Traffic Citation
The common outcome is a citation under Section 4A for passing within the same lane.1General Court of Massachusetts. Massachusetts General Laws Chapter 89 Section 4A This is a civil motor vehicle infraction. Beyond the fine, the violation feeds into the state’s Safe Driver Insurance Plan, so your insurer will likely learn about it and can surcharge your policy. Those surcharges stay on your record for years.
Reckless Operation
If the officer treats the splitting as dangerous, the charge can escalate to reckless operation of a motor vehicle under Chapter 90, Section 24. That is a criminal offense. The penalty is a fine between $20 and $200, imprisonment of two weeks to two years, or both, plus a mandatory $250 assessment that courts cannot reduce or waive for any reason.2General Court of Massachusetts. Massachusetts General Laws Chapter 90 Section 24 A conviction also leaves you with a criminal record, which is usually a bigger problem than the money.
The decision to escalate is at the officer’s discretion. Splitting at highway speeds, in bad weather, or in a way that causes a near-miss all make a reckless operation charge much more likely.
What Happens If You Crash While Splitting
The quieter but often more expensive consequence shows up after an accident. Massachusetts uses modified comparative negligence under Chapter 231, Section 85. You can recover damages from another driver only if your own share of fault is 50 percent or less, and your recovery is reduced by whatever percentage of fault is assigned to you. Cross that 50 percent line and you recover nothing.3General Court of Massachusetts. Massachusetts General Laws Chapter 231 Section 85
Lane splitting at the moment of a crash is a serious problem under that framework. The same statute provides that “violation of a criminal statute, ordinance or regulation by a plaintiff which contributed to said injury, death or damage, shall be considered as evidence of negligence.”3General Court of Massachusetts. Massachusetts General Laws Chapter 231 Section 85 The other driver’s insurer will use your Section 4A violation to push your fault percentage above 50 percent. A violation is not an automatic bar to recovery, but it gives the opposing side a strong lever.
Even when the other driver clearly did something wrong, such as changing lanes without signaling, an adjuster weighing fault will keep coming back to the fact that you were between lanes illegally. In states where splitting is prohibited, adjusters routinely assign the majority of fault to the splitting rider. The practical result: your injury claim gets slashed or wiped out, while the other driver’s damage claim against you remains intact.
Attempts to Change the Law
Several bills have tried to carve out some form of legal lane use for motorcycles, and none has passed. House Bill 3064 in the 191st session (2019–2020) would have let riders use breakdown lanes during heavy traffic.4General Court of Massachusetts. Massachusetts Bill H.3064 It did not advance. Senate Bill 2238 in the 193rd session went further, proposing to allow “motorcyclists’ use of a breakdown or access lane or splitting travel lanes” under specific conditions. It was referred to a study order in February 2024, which effectively shelved it.5General Court of Massachusetts. Massachusetts Bill S.2238 Primary Sponsor Summary
The current 194th session includes House Bill 3729, “An Act protecting motorists and emergency personnel,” which touches on related motorcycle lane access issues. The pattern so far has been consistent: proposals get filed, draw some committee attention, and die without a vote. Nothing on the books is about to change for riders planning their next commute.
Reducing Risk in Heavy Traffic Without Breaking the Law
The thing that pushes riders toward splitting, sitting exposed between bumpers in stopped traffic on the Pike or Storrow Drive, is a real concern. A few habits reduce the rear-end risk without putting you between lanes.
- Tap your brake pedal while stopped so your brake light pulses and draws the eye of the driver behind you.
- Position yourself toward one side of the lane rather than dead center so you have an escape route if the car behind doesn’t stop in time.
- Keep checking your mirrors the entire time you are stopped, not just as you come to a halt.
- Add auxiliary brake lights that flash on deceleration, and wear high-visibility gear.
None of this eliminates risk, but it keeps you inside the law and inside your insurance company’s good graces. Until the legislature changes Section 4A, splitting lanes in Massachusetts means accepting the citation, the possible criminal exposure, and the comparative negligence hit if anything goes wrong.