[tarpherder]

40kmph is actually very fast compared to the average cyclist. Fast enough that I would consider it reckless if done in heavy (cycling) traffic.

But you highlight the issue nicely; bikes are not self-powered, it depends on the human. Even with e-bikes this is true, most of them will only support the rider and have been made not to power the bike all by itself. So how to regulate that? Perhaps a good old speed limit is all that is really needed.

[intrasight]

Agreed. Enforcement is a challenge however. Bikes don't have license plates.

[tarpherder]

True, but the police can ride bikes, especially in cities where the speed limit will matter most.