Well, let's go into nanny-state mode and see:
If you ban cars, how will people in areas of the world designed for cars get access to food? Heathcare?
Expand mass transit and force people to relocate into denser urban living situations (see below as to how). Fixed.
How will companies that service utilities service the infrastructure?
Eventually, certified/approved CDL-licensed drivers will still be allowed on the roads, but no one else without a special (and costly) permit shall be allowed. Because, you know, the commercial drivers don't die as often as the typical passenger car drivers do.
How many people would consequentially die by banning cars?
You ban it the same way TFA wants to ban smokes and fatty foods - you make it so effing expensive and obstacle-laden that folks won't have a choice but to move to a dense city and rely solely on buses, trains, etc. You know, sort of like Caves of Steel.
It's for your own good, Citizen; we care enough about you to go to all this bother to protect you, so why are you whining so much about it and not just doing what you're told?