We have excellent public transportation where I live (Norway), but after I got kids I needed a car. It's not just about public transportation being a success.

We try to use public transportation as much as possible but sometimes it just isn't possible. I can't carry 4 bags of groceries on a public bus while having two kids in tow after an 8 hour work day.

The focus should be making the cars pollute less not remove them (except in city centres where they do not belong).