Helmet Laws
Where helmets are required by age and where they are not - all 50 states + DC.
US Bicycle Laws by State & Topic
Last reviewed by BikeSize EditorialBicycle laws in the United States are set state-by-state, with cities and counties layering on their own rules. This hub is the entry point for every BikeSize bike-laws guide: a state lookup that takes you straight to the rules for where you ride, plus topic articles that compare the country at a glance - helmets, sidewalk riding, lights, DUI, hand signals, and more. We focus on traditional pedal bicycles ridden on US public roads; e-bike rules vary by class and are usually governed by a separate statute. Everything here is general legal information, not legal advice - see the full legal disclaimer before relying on any of it.
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.
Find laws by your state
Pick a state to see helmet, sidewalk, lights, and DUI rules with statute citations.
Browse by topic
Topic guides launching through 2025-2026. The state lookup above gives you per-state rules now.
Helmets: Adults vs Children
How helmet rules differ for minors and the (very rare) adult mandates.
Sidewalk Riding
Where sidewalk cycling is legal, prohibited, or left to the city.
DUI on a Bicycle
Whether you can be charged with DUI on a bike, including cannabis.
Child Cycling Laws
Age limits, child seats, trailers, and helmet rules for kids.
Registration & Licensing
Whether you need to register or license a bicycle in your state.
Lights & Reflectors
Required lights, reflectors, and visibility gear by state and time of day.
Hand Signals
Legal hand-signal requirements and how to use them on the road.
Right-of-Way & Traffic Rules
Stop signs, the Idaho Stop, and how cyclists fit into traffic law.
Bike Lane Laws
"Must use" bike-lane rules, exceptions, and protected-lane treatment.
Group Riding & Two-Abreast
Two-abreast, paceline, and group-ride rules state by state.
Drinking & Cycling
Open-container and BAC rules that apply when you are on a bike.
Headphones & Earbuds
Where wearing headphones while cycling is restricted or prohibited.
Highways & Interstates
Where bicycles are allowed on highway shoulders and interstate segments.
Key federal & national rules
CPSC bicycle helmet standard (16 CFR Part 1203)1
Every bicycle helmet sold in the United States must meet the Consumer Product Safety Commission impact standard set out in 16 CFR Part 1203. The standard covers attenuation, retention, and labeling - it is what state helmet laws are usually referencing when they require a "CPSC-certified" helmet.
CPSC bicycle requirements (16 CFR Part 1512)2
Part 1512 sets the federal manufacturing requirements for bicycles themselves: braking performance, reflector placement, steering, sharp-edge limits, and more. It defines what qualifies as a "bicycle" for federal purposes - which matters in turn for how state vehicle codes apply.
NHTSA cyclist safety guidance3
The National Highway Traffic Safety Administration publishes cyclist safety guidance, crash data, and model behaviour recommendations that state DOTs and city traffic-safety teams draw on when writing local rules. NHTSA does not set binding behaviour rules for cyclists itself.
International coverage
BikeSize's bike-laws hub focuses on the United States. Our topic articles include short summary sections for the most-asked- about jurisdictions outside the US - full country hubs are not planned for v1.
United Kingdom
Summary inside topic articles
European Union
Summary inside topic articles
Canada
Summary inside topic articles
Australia
Summary inside topic articles
Frequently asked questions
Methodology & sources
Every legal claim on a BikeSize laws page is anchored to a primary source: state vehicle codes accessed through official legislative portals, CPSC and NHTSA publications, state DOT cycling guidance, and municipal codes via Municode and American Legal. Secondary sources - League of American Bicyclists report cards, IIHS data, BHSI summaries - are useful for context but never cited for the legal claim itself. We do not cite law-firm blogs, content sites, or wikis for the underlying rule. Every state record is reviewed at least annually and re-verified whenever a tracked statute changes; pages past their twelve-month review window flag themselves for re-checking. The state JSON dataset that powers the hub is open content and lives in the repository alongside this page.