Car Accident Laws in Massachusetts (2026)

Massachusetts is one of a diminishing number of states that still uses a "no-fault" auto insurance system for minor accident injuries — but Massachusetts's no-fault system is meaningfully different from Florida's or Michigan's. Under Massachusetts's Personal Injury Protection (PIP) mandate (M.G.L. c. 90, § 34A et seq.), every registered vehicle must carry at least $8,000 in PIP coverage. PIP pays the first $8,000 of medical expenses and 75% of lost wages (up to certain limits) to the injured person regardless of who caused the accident — processing claims through the injured person's own insurer, not the at-fault driver's insurer. This no-fault-first framework means most minor injury claims never become liability claims against the at-fault driver.

The tort threshold — when can you step outside the no-fault system and sue the at-fault driver? Massachusetts uses a "serious injury" threshold (M.G.L. c. 231, § 6D): a plaintiff may bring a bodily injury tort claim against the at-fault driver only if the injury involves death, loss of a body member, permanent and serious disfigurement, loss of sight or hearing, or medical expenses exceeding $2,000. The $2,000 medical expense threshold (which hasn't been adjusted for inflation since the 1980s) is easily crossed in modern Massachusetts accidents involving emergency room treatment, physical therapy, or any imaging studies. Once the threshold is met, the plaintiff exits the no-fault system and pursues a standard tort claim. Massachusetts's no-fault system therefore functions mainly as a delay/reduction mechanism for minor soft-tissue injuries rather than a true first-party-only system like the old no-fault model envisioned.

Modified Comparative Fault: The 51% Bar

Massachusetts follows modified comparative fault under M.G.L. c. 231, § 85, with a 51% rule: a plaintiff who is 50% or less at fault may recover, but their damages are reduced by their percentage of fault; a plaintiff who is 51% or more at fault recovers nothing. This is materially different from pure comparative fault states (Arizona, Washington) where a 70% at-fault plaintiff still recovers 30% of damages. In Massachusetts: being found more than 50% responsible completely bars recovery. The practical effect: comparative fault negotiations in Massachusetts are particularly important, because the difference between a 49% allocation to plaintiff and a 51% allocation is not a 2% difference in recovery — it's the difference between partial recovery and zero recovery. This creates hard negotiating leverage for defense counsel in cases where plaintiff conduct was substantial.

Route 128 Tech Corridor, Boston Harbor Tunnel, and Urban Accident Realities

Massachusetts's accident landscape is heavily urban — Greater Boston's network of highways (I-93, I-95/Route 128, I-90 Massachusetts Turnpike, the Ted Williams Tunnel and Sumner Tunnel under Boston Harbor) creates specific accident contexts. The Boston-Cambridge urban corridor generates high-density pedestrian and cyclist accidents — Massachusetts law provides specific pedestrian right-of-way protections (M.G.L. c. 89, § 11) imposing duties on drivers approaching crosswalks. Bicycle accidents in Cambridge, Somerville, and Boston's bike lane network involve both driver negligence and municipal liability questions when infrastructure defects contributed. The Green Line and Red Line T (MBTA) stations create pedestrian mixing with high-traffic arteries at subway entrance/exit points — accidents at T station areas have produced cases addressing both MBTA liability (with specific procedural requirements) and driver liability. Massachusetts's high cost of living means economic damages in Massachusetts accident cases include some of the highest medical costs, lost wages, and future earning capacity calculations in the country.