Hawaii

Hawaii defines an all-terrain vehicle as a motor vehicle designed for off-highway operation that is fifty inches or less wide, weighs nine hundred pounds or less unladen, is suspended on three or more tires, and has a straddle seat and handlebars, so the definition does not cover a two-wheeled machine. The definition does not mention the power source. A motorcycle is a motor vehicle with a seat or saddle designed to travel on not more than three wheels, and a motor vehicle includes every vehicle propelled by electric power that is not operated on rails, except a moped.

HRS § 286-12(b); HRS § 291C-1, checked 2026-09-26. Official text for Hawaii, HRS § 286-12(b); HRS § 291C-1, external site

On Na Ala Hele program trails and accesses, the state trail rules prohibit, except as authorized in writing by an authorized representative, driving, operating, or using any motorized vehicle on a program trail not designated and posted for that purpose. They also prohibit driving, operating, or using any motorized ground vehicle without a functioning street legal muffler, and without a valid vehicle license plate, registration, and safety sticker as required by each county. The rules define a motorized vehicle as one that depends on a motor (gas, electric, or other fuels) for propulsion.

Haw. Admin. R. §§ 13-130-2, 13-130-28(a)(3), (6), checked 2026-10-01. Official text for Hawaii, Haw. Admin. R. §§ 13-130-2, 13-130-28(a)(3), (6), external site

Since July 15, 2026, no person may operate a high-speed electric device, defined as a device with a motor exceeding 750 watts that is capable of speeds over 28 mph, on a public roadway, bicycle lane, travel path, bicycle facility, or other public area such as a street, highway or sidewalk. The high-speed device definition excludes a moped or motor vehicle registered as required by law. Every motor vehicle to be operated upon the public highways must be registered with the county director of finance.

Act 259, SLH 2026 (new HRS ch. 291C section and HRS § 291C-1 definition); HRS § 286-41, checked 2026-09-26. Official text for Hawaii, Act 259, SLH 2026 (new HRS ch. 291C section and HRS § 291C-1 definition); HRS § 286-41, external site

Since July 15, 2026, an electric bicycle is a bicycle equipped with fully operable pedals and an electric motor of no more than seven hundred fifty watts. Class 1 assists only while pedaling and stops at 20 mph, Class 2 may propel the bicycle by the motor alone but cannot assist at 20 mph, and Class 3 assists only while pedaling, stops at 28 mph and has a speedometer. The definition does not include a high-speed electric device (motor over 750 watts and capable of more than 28 mph).

HRS § 291C-1 (as amended by Act 259, SLH 2026), checked 2026-09-26. Official text for Hawaii, HRS § 291C-1 (as amended by Act 259, SLH 2026), external site