The new US law regards electric bicycles with fully functioning pedals, no more than 750 watts motor output and 20 mph top speed as “bicycles”.
 

 
The US Senate has passed SR 1156, clearing the way for a legal definition of an electric bicycle in the USA. President Bush has signed this law.
The new law will assign the governance of electric bicycles to the Consumer Product Safety Commission, and will define a bicycle that has pedals, (and is capable of being propelled by those pedals) an electric motor of no more than 750 watts, and a top speed (on motor only) of 20 mph as a "bicycle."