Musk's latest venture, The Boring Company, has put out a concept video for its planned transportation overhaul. The pitch involves electric platforms whisking cars along a nexus of subterranean tracks at over 120 miles per hour, in some cases.
Musk is apparently serious about the whole thing: He's reportedly acquired a tunnel-boring machine to dig on SpaceX's campus.
Needless to say, this project has a lot going against it. Digging tunnels is slow work, and literally uprooting the traffic system of an entire city sounds like a logistical and bureaucratic nightmare.