Ran a Red Light or Rode on the Sidewalk? What Being Partly at Fault Means for a Cambridge, MA Bike Accident Claim

Maybe you rolled through a red light on Massachusetts Avenue because the cross street looked empty, or rode the sidewalk in Central Square to get around a double parked truck, or your rear light died on the way home from Kendall Square. Then a driver hit you, and now the adjuster keeps circling back to what you did wrong. Cyclists in Cambridge, Massachusetts ask us about this constantly, usually convinced their claim is already dead.

It usually is not. Massachusetts law treats a rule you broke as one fact among many, not as a verdict, and the statutes say so in plain language.

The Rules Cambridge Cyclists Actually Have to Follow

The starting point is General Laws chapter 85, section 11B. It gives every cyclist the right to use all public ways in the Commonwealth, apart from posted limited access highways, and makes cyclists subject to the same traffic laws as everyone else. Red lights, stop signs and one way streets bind you on a bike just as they bind a driver, and Massachusetts has not adopted a stop as yield law, unlike Idaho and several other states. Section 12.2 of the Cambridge Traffic, Parking and Transportation Regulations says the same thing locally: a cyclist must obey official traffic signals and signs.

Section 11B then adds bicycle specific rules. You must signal turns and stops by hand, and from a half hour after sunset to a half hour before sunrise you need a white front light visible from 500 feet and a red rear light plus a red reflector visible from 600 feet. The lighting clause carries its own limit: it is enforced only when a cyclist has been stopped for some other offense, and a violation of the rear lighting rule shall not be used as conclusive evidence of contributory negligence in any civil action. The penalty for breaking section 11B is a fine of not more than 20 dollars, and section 11E says a bicycle citation cannot touch your driver’s license or your standing in the safe driver insurance plan. A ticket is not a finding about your injury claim.

Sidewalk Riding: Allowed in Parts of Cambridge, Banned in the Squares

State law allows riding on a sidewalk outside a business district when necessary in the interest of safety, unless a city directs otherwise, and Cambridge does direct otherwise. Section 12.8 of the city regulations bans bicycles on every sidewalk inside the Harvard Square and Central Square business districts, and on posted sidewalks in Inman Square, Huron Village and a stretch of Massachusetts Avenue around Russell and Wendell Streets.

Sidewalk crashes tend to happen at driveways and crosswalks, where a driver pulling out does not expect a bicycle to appear. If you were on a banned sidewalk, the insurer will point to section 12.8, and that fact goes into the fault calculation below. It does not end the conversation. The driver still had a duty to look before crossing a sidewalk, and the state statute itself treats a sidewalk as the safer place to be in some situations, for example when a blocked bike lane has pushed you out of your lane.

What Massachusetts Law Says About a Cyclist Who Broke a Rule

The controlling statute is General Laws chapter 231, section 85, the modified comparative negligence law. Its first rule is the familiar one: you can recover as long as your share of the negligence was not greater than the combined negligence of the people you are suing, and whatever you recover is reduced by your percentage. Cross 50 percent and you recover nothing.

The second paragraph of section 85 is the part insurers rarely mention. A plaintiff’s violation of a criminal statute, ordinance or regulation that contributed to the injury shall be considered as evidence of negligence, but the violation shall not, as a matter of law and for that reason alone, bar recovery. The violation has to have contributed to the crash, so riding a banned sidewalk two blocks earlier says nothing about a driver who hit you from behind in a bike lane. And even a violation that did contribute is only evidence, weighed against everything the driver did.

Section 85 also puts the burden where it belongs. The person claiming you were negligent has to allege and prove it, the plaintiff is presumed to have been in the exercise of due care, and the old defense of assumption of risk is abolished outright. An insurer cannot argue that you accepted the danger simply by riding in city traffic.

Being told the crash was your fault? Get a free case review from a Cambridge bicycle accident attorney. Call 617-683-1983.

Why Most Cyclists Stay Well Under the Line

What keeps most cyclists far from 51 percent is the driver’s own list of duties. Chapter 90, section 14 requires a driver to leave at least four feet when passing a cyclist, forbids a right turn across a cyclist the driver has just overtaken, and requires a left turning driver to yield to an oncoming bicycle. A driver who was speeding, looking at a phone or turning without checking the bike lane brings substantial negligence to the comparison, as our post on who is at fault when a car hits a cyclist in Cambridge explains. The hard cases are the ones where the cyclist’s violation was the direct cause, such as riding through a red light at speed into a driver with the green. Even then, the question is percentages, not disqualification. Some rules are off the table entirely: section 11B says a violation of the child helmet requirement shall not be used as evidence of contributory negligence at all, a point our post on riding without a helmet in Cambridge, MA covers in detail.

PIP Pays Even if the Crash Was Partly Your Fault

Fault has no bearing on the first layer of coverage. Under chapter 90, section 34A, personal injury protection from the driver’s policy pays a cyclist’s reasonable medical expenses and 75 percent of lost wages, up to 8,000 dollars, without regard to negligence or gross negligence or fault of any kind. The statute’s definition of pedestrian expressly includes persons operating bicycles, and the exclusions it lets insurers apply are written for someone whose conduct contributed to the injury while operating a motor vehicle, which a bicycle is not. A PIP claim must be presented within two years of the crash.

Everything PIP does not cover, including pain and suffering, runs against the driver’s bodily injury coverage, which for policies issued or renewed since July 1, 2025 carries a minimum of 25,000 dollars per person and 50,000 dollars per crash. That is the claim your percentage of fault reduces. Our guide to insurance after a Cambridge bike accident walks through how the layers fit together.

What to Do if You Think the Crash Was Partly Your Fault

Stop apologizing. Hurt and shaken cyclists tend to tell the driver, the officer and the adjuster that they should have stopped or should have had a light, and those statements get quoted back months later. Describe what happened factually, and decline a recorded statement to the driver’s insurer until you have talked to a lawyer. Section 11B requires you to report any injury crash to the local police, so make sure a Cambridge Police report exists. Photograph the intersection from your direction of travel, save ride data from a bike computer or phone app, and collect witness names, because speed and position at the moment of impact often decide a shared fault dispute. The lawsuit deadline is three years under chapter 260, section 2A, but a claim that blames a road defect rather than a driver requires written notice to the city within 30 days under chapter 84, section 18.

A rule you broke on the day of the crash is a fact to be weighed, not a reason to accept whatever the insurer offers. A Cambridge bicycle accident lawyer at Melanson Law Group can tell you how a Middlesex County jury would likely divide the fault and what the claim is worth after that division. The consultation is free, and you pay nothing unless we recover for you. Call 617-683-1983.