It's bad because it's not public transportation? Is that really an argument? The idea is clearly that tunnels allow you to scale along the z-axis, and thus fa

It's bad because it's not public transportation? Is that really an argument? The idea is clearly that tunnels allow you to scale along the z-axis, and thus facilitate density. Whether that's car-sleds or small trains or something else, that's not really the point. This also shows a lack of imagination with regard to public transit; yes it's very efficient in some ways, but door-to-door transport is very desirable as well. With the development of small electric vehicles and autonomous driving, a hybrid mode of transport becomes possible; small vehicles can come together in 'trains' or along special corridors that still permit door-to-door service. There are plenty of good criticisms for Musk's various projects, but griping about a fun video is disappointing.