I'm in the SF Bay Area and see small kids pre-adolescent or barely adolescent riding e-bikes with insane acceleration and speeds. The kind of performance, that in my youth, would come from a 250cc four-cycle motorcycle or 125cc 2-cycle motocross bike. And they are riding with absolutely no sense of traffic rules nor that they themselves are part of the same traffic. It's a really bad combination.

It doesn't matter what tiers there are when parents are negligently providing their kids with these kinds of "toys". I don't know if they are totally ignorant and think "it's just a bicycle" or if they know exactly what it can do and just can't see that their kid isn't ready for the responsibility.