An overview of Massachusetts's bicycle laws, reviewed and cited to primary sources. Use the sections below to jump to a specific rule, or the Sources block at the end for the full citation list.
This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
Helmet rules
Required under age
Required under age 17
Applies to passengers
Yes
Standard
ANSI Z90.4, Snell, or ASTM F1447 (CPSC-certified helmets meet these specifications)
Penalty
Non-criminal violation; no fine in practice for first offense. The statute applies to anyone aged 16 or younger and to passengers carried in a child seat or trailer (passengers must be at least one year old).
Mass. Gen. Laws ch. 85, § 11B permits bicycles on sidewalks outside business districts when necessary in the interest of safety, unless local ordinances or by-laws say otherwise. The same section requires riders to yield the right-of-way to pedestrians and to give an audible signal before overtaking and passing. Boston, Cambridge, and Somerville each prohibit sidewalk riding in their central business districts and on streets where bicycle lanes are provided.
Massachusetts's OUI statute (M.G.L. ch. 90 § 24) applies only to operators of a 'motor vehicle' on a public way. Bicycles are not motor vehicles under Massachusetts law, so a cyclist cannot be charged with OUI. Public-intoxication, disorderly-conduct, or related offenses may still apply.
White headlamp on the front visible from at least 500 feet, required from 30 minutes after sunset to 30 minutes before sunrise.
Rear requirement
Rear reflector or light
Rear spec
Either an approved red rear reflector visible from 600 feet in motor-vehicle headlights, or a red rear lamp visible from 600 feet. Reflectors or reflective material are also required on each pedal (or on the rider's ankles) and on each side of the bicycle, all visible from at least 600 feet — Massachusetts has the strictest side- and pedal-conspicuity rules in the country.
Two abreast permitted on the roadway, but riders must move to single file when being overtaken by other traffic. Three or more abreast is not permitted.
Bicycles are prohibited on Massachusetts Interstate highways (I-90 Mass. Pike, I-93, I-95, I-195, I-290, I-495) under MassDOT controlled-access regulations. The Bourne and Sagamore Bridges over the Cape Cod Canal carry separate sidewalks for bicycles. Conventional US and state routes (US-1, US-3, MA-2) remain open.