After you've done that, in combination with sidewalks, you have effectively created a pedestrian-only street above the cars.
Aren't there large parts of Chicago already like that?
Aren't there large parts of Chicago already like that?
Chicago is also somewhat of an exceptional city in this regard in that it was to an extent demolished and rebuilt twice, and the city was further built up from water level to accommodate underground plumbing and (IIRC) to reduce the swampiness of the land.