In California, Electric Bicycles are limited to LESS THAN 750 watts.
Low Speed Pedal Assist will ‘help’ no more than 20 mph. (Class 1)
Speed Pedal Assist will ‘help’ to no more than 28 mph and have no throttle (Class 3)
Low Speed Throttle Bikes can go no more than 20 mph on electric power.

All the eBikes that exceed those limits, with or without pedals, are vehicles and should be registered and operated as mopeds or motor-driven cycles or motorcycles. (By No one without at least an M1 or M2 drivers license and only with a DOT Motorcycle helmet)

So be advised - if you are riding any electric bicycle and pedaling FASTER than 28 mph on a street that has a posted speed limit and traffic going faster you could get cited for speeding:

Sec. 4-7-205. - Speed.
No person shall operate a bicycle or electric bicycle at a speed greater than is reasonable and prudent under the conditions then existing, and in no event at a speed which endangers the safety of persons or property. No electric bicycle operator shall travel over 28 miles per hour on a public highway.

That does not seem to take into account a strong riders who can out-pedal the 28 mph assist, or gravity on a downhill road, or the importance of matching traffic speeds when able to… It also does not include all those eBikes that are NOT electric bicycles - Like that Super73 eBike in the picture below (Oops)