[mousquet]

Lol, you guys might as well build underground parking garages. You know, buried under buildings themselves like the dead, so their ugliness and rot is not visible at street level.
That is not banned, huh. It is even actually recommended. But it must be slightly more expensive than overground parking.

That's what they most often do in Greater Paris these days, but there's a constraint to it. Most often, you get less than one underground parking spot per unit in a building. That means not even one car per household.
This is a natural constraint anyway, cause once a spot is densely populated, cars simply turn impossible because they take too much room.

If you want to keep your shiny car, you just move to subsidized suburbia or the independent countryside where good farmers grow their crops to feed us all. That's about it.
That's what urban planning experiments and experience show to us all. It's like mere math.