Comment by Tiktaalik

Oh my god Musk is the one pitching the "faster horse" solution here.

He wants to travel faster and doesn't want to deal with congestion, and so he comes up with this zany idea for cars on sleds in tunnels.

Maybe the real problem here is the car. Car oriented infrastructure simply doesn't scale well as demand increases.

His solution is going to run into all the same issues of induced demand just the same as highway expansion has.