Code of Federal Regulations Title 43. Public Lands:  Interior § 43.420.5 Definitions

(1) Nonamphibious registered motorboats;

(2) Military, fire, emergency, or law enforcement vehicles when used for emergency purpose;

(3) Self-propelled lawnmowers, snowblowers, garden or lawn tractors, and golf carts while being used for their designed purpose;

(4) Agricultural, timbering, construction, exploratory, and development equipment and vehicles while being used exclusively as authorized by permit, lease, license, agreement, or contract with the Bureau;

(5) Any combat or combat support vehicle when used in times of national defense emergencies;

(6) “Official use” vehicles;  and

(7) Electric bikes as defined by paragraph (h) of this section:  While being used on roads and trails upon which mechanized, non-motorized use is allowed, that are not being used in a manner where the motor is being used exclusively to propel the E–bike for an extended period of time, and where the Regional Director has expressly determined, as part of a land-use planning or implementation-level decision, that E–bikes should be treated the same as non-motorized bicycles.

(1) Class 1 electric bicycle means an electric bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour.

(2) Class 2 electric bicycle means an electric bicycle equipped with a motor that may be used exclusively to propel the bicycle, and that is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour.

(3) Class 3 electric bicycle means an electric bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour.