A real car-free city
Tommy pointed to this mini-docu about a German town, Vauban, without cars.
And then of course there's the dramatic lowering of air polution and the heightening of everybody's health when they use bicycles. And the drop in car-related deaths and injuries.
I guess some people need a car for purposes of their work or otherwise, but I think the example of this German town without any cars shows that maybe most people's "need" is more of a "want" or a habit.