An overview of New Hampshire'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 16
Applies to passengers
Yes
Standard
ANSI Z90.4, Snell, or ASTM (a CPSC-certified helmet meets these specifications)
Penalty
RSA 265:144 requires every operator and passenger under 16 to wear a properly fitted helmet that meets ANSI, Snell, or ASTM standards on any public way, public bicycle path, or other public right-of-way. The first offense is a warning; subsequent offenses carry a fine of up to $25, which a court may waive on proof of helmet purchase.
New Hampshire has no statewide statute permitting or prohibiting sidewalk cycling. RSA 265:144 governs equipment and rider behaviour but is silent on sidewalks. Manchester restricts sidewalk riding in the central business district; Portsmouth bans it in the historic downtown; smaller towns generally permit sidewalk riding except where signed.
New Hampshire's DWI statute (RSA 265-A:2) applies to anyone who 'drives or attempts to drive a vehicle upon any way' while under the influence. In practice the New Hampshire courts read the statute as reaching motor vehicles and OHRVs, and cyclists are not charged with DWI; the parallel boating-while-intoxicated and OHRV-while-intoxicated statutes are codified separately. Public-intoxication and disorderly-conduct charges remain available.
Lamp on the front emitting a white light visible from a distance of at least 300 feet to the front, required from one-half hour after sunset to one-half hour before sunrise.
Rear requirement
Rear reflector or light
Rear spec
Red reflector on the rear visible from at least 300 feet to the rear when directly in front of lawful lower-beam headlamps. A red rear lamp visible from 300 feet may be used in addition to the reflector.
Two abreast permitted on the roadway except on parts of roadways set aside for the exclusive use of bicycles, where the cap does not apply. Riders shall not impede the normal and reasonable movement of traffic.
Bicycles are prohibited on New Hampshire Interstate highways (I-89, I-93, I-95) and on the toll-road portions of the Everett, Spaulding, and Central Turnpikes under New Hampshire Department of Transportation (NHDOT) controlled-access regulations. Conventional US and state routes (US-3, US-4, NH-101) remain open to bicycles.