How to design a city?

I understand. I have a few ideas of how it could be quantifiable but unfortunately not enough time to try them all out. Maybe I should try to get a job doing some urban traffic modeling.:)

Go for it. We definitely need more sensible people doing that sort of work. Ideally, of course, the role of modelling would be reduced in those places where the streets have more of a function than just a transport function, e.g. in a city. Back on topic, ba-damm! ;)