So it's a car for your car. This seems like an obscenely expensive way to not really solve any problems. Massive underground construction plus ongoing maintenance of a million moving parts.<p>Just take a helicopter or something, Elon.
I'm 100% convinced this is a joke. The costs to do this are astronomical. I'll bet anyone $100 that within 6 months from today, this will be revealed to be a prank. Most likely a Nathan for You skit.