It will depend on your definition of "city". I live in Melbourne, AU, and realistically only the inner couple of km around the CBD are "proper" city area where

It will depend on your definition of "city". I live in Melbourne, AU, and realistically only the inner couple of km around the CBD are "proper" city area where space is truly at a premium. In the CBD and surrounding area you'd have to be insane to drive - there's simply not enough space. However, in the "metro area" which sprawls for many km in all directions, I would expect a lot of commuting is done by car, due to poorer PT service coverage and frequency, along with lesser traffic congestion.