LOL. But in all seriousness, it'd probably be cheaper to do this than our current infrastructure obsession with multibillion dollar trains to nowhere.

@PhilWMagness I think the tunnel version of this will make sense with autonomous, electric cars. Autonomous cars should be able to run at over 100 MPH with a fraction of a second between cars. That is high-bandwidth and low-latency transportation.

@KernelArray @PhilWMagness They still won't run that close because a mechanical failure would be instantly deadly.

@NavyStrang @PhilWMagness Closer is safer. It removes the time and space to build up a speed difference. Each tunnel should be single narrow lane with plastic walls. That way it is impossible to hit the side fast. As a bonus, a circular one lane tunnel has 1/4th the cross section of a two lane tunnel.

@KernelArray @PhilWMagness That is not how physics works. Have you never seen a high speed crash in an auto race?