I'm in Netherlands on holiday and I'm amazed at the biking infrastructure. It's just so much friendlier than cars. More space-efficient, more personal, and probably way greener too.
Of course this is helped by the fact that Netherlands are flat as a pancake. But you could build a bike-based city anywhere. Esp. if the bikes are electric. Ideally, cheap pieces of electric junk, so that nobody is motivated to steal them.
I want to live in a city like that.