Start with the vehicle classification, then check your state and local route. Federal manufacturing requirements and permission to drive on a particular street are separate questions.
Street-legal registration and operating rules for low-speed vehicles vary by state and local jurisdiction and may change. This information is general guidance only. Confirm current requirements with your state DMV and local authorities before registering or operating your WaterCar on public roads.
An LSV has four wheels, an attainable speed in one mile of more than 20 mph but no more than 25 mph on a paved, level surface, and a gross vehicle weight rating (GVWR) of less than 3,000 pounds. A 3,000-pound rating does not meet that limit.
GVWR is the manufacturer’s rated loaded weight. It is different from curb weight or a reading from a scale. See 49 CFR 571.3.
LSV is a federal vehicle classification. State terms such as neighborhood electric vehicle (NEV), golf cart and converted golf cart can have different definitions and registration pathways. Permission for golf carts on a road does not establish permission for every LSV or amphibious vehicle. Adding equipment or changing speed does not, by itself, establish a lawful conversion or registration approval.
FMVSS 500 addresses speed and required lighting, reflectors, mirrors, a parking brake, compliant windshield, VIN and seat belts at designated seating positions. Its requirements also include rear visibility and sound provisions; an abbreviated equipment checklist is not a complete compliance determination.
For LSVs manufactured on or after May 1, 2018, FMVSS 111, S6.2 requires a rearview image meeting the specified performance rules. FMVSS 141 covers electric and hybrid LSVs within its scope, with full compliance required for covered vehicles manufactured on or after March 1, 2021.
The manufacturer’s certification label identifies the vehicle and its ratings. 49 CFR 567.4 addresses certification labels for vehicles within its scope, including the VIN, vehicle type, manufacture date, GVWR and axle ratings. Seating and cargo affect the required weight rating. Use the documentation for the particular model and configuration; a boat capacity label is not a substitute for road-vehicle ratings.
Some changes to an already certified vehicle before its first purchase for use can make the person performing the changes an alterer under 49 CFR 567.3. Readily attachable components and minor finishing operations are treated differently.
Under 49 CFR 567.7, an alterer must determine continued compliance with the standards affected by the work and provide the required additional certification label. The original certification and information labels remain. Changes to weight ratings or vehicle type require the applicable revised information. A title, VIN or added label alone does not establish that the modified vehicle meets every applicable requirement.
A federal classification does not authorize every road. State title, registration, insurance and driver requirements, local restrictions, crossings and the intended route still matter. An amphibious vehicle also needs its applicable vessel paperwork and boating safety requirements checked separately. Road registration does not replace those checks.
Alteration provisions checked October 15, 2026 using eCFR Title 49 text reporting currency through October 13, 2026. The classification and equipment sections were checked October 14, 2026. These are existing requirements, not an announcement of a new rule or a determination that a particular vehicle complies. Additional standards and administrative duties may apply to a manufacturer or specific configuration.