Maybe that's a sign that we have more cars than we can handle.
Pretty ingenious way to hide a 1500 spot carpark underneath.
Toronto is thinking of doing something similar, except to hide the downtown rail lines instead.
If you can get natural light in people could live under the mound. Then you can have a city that looks like a park! People could quickly walk or cycle to where they need to go. Cars stay in tunnels.
Sshhhh, you'll out the inner earth people.