Hong Kong has that in some places. It makes it hard to navigate on foot, as pedestrian routes are no longer obvious lines but require entering building perpendi

Hong Kong has that in some places. It makes it hard to navigate on foot, as pedestrian routes are no longer obvious lines but require entering building perpendicular to your direction, for example. However, the idea is nearly perfect. All it really needs is to put the cars in tunnels. Underground there's plenty of room for driving, parking, etc.