EV-Village

Nevada

Definitive Reference: Nevada DMV regulations on Motorcycles, Mopeds & Bicycles
Excerpts, current as of July 2008:

Mopeds (and presumably, motor-powered bicycles)

"A moped is a vehicle which looks and handles essentially like a bicycle and is propelled by a small engine which produces not more than 2 gross brake horsepower, has a displacement of not more than 50 cubic centimeters and is capable of a maximum speed of not more than 30 miles per hour on a flat surface with not more than 1 percent grade in any direction when the motor is engaged.  (NRS 486.038)

"You must have a Class C or higher driver license to drive a moped or motorized bicycle on a public street. You do not need a Class M license. Mopeds do not require insurance or vehicle registration. If the moped produces more than 2 gross brake horsepower, or has a displacement of more than 50 cubic centimeters (50 cc), or is capable of exceeding thirty miles per hour (30 mph) on a flat grade, it is considered a motorcycle and you must have a Class M license, registration and insurance."

California

Definitive Reference: California DMV Regulations on Motorcycles, Mopeds, Scooters
Excerpts, current as of July 2008:

Mopeds

• "A 'motorized bicycle' or 'moped' is any two-wheeled or three-wheeled device having fully operative pedals for propulsion by human power, or having no pedals if powered solely by electrical energy). CVC Sec. 406(s) 406 (b)
• "A Motorized Bicycle is issued special license plates and identification cards, which require a one-time $18 fee. No renewal required. (M2) moped/scooter only license or an M1."