They're very dangerous to occupants and other people, emit unhealthy pollution, emit greenhouse gases, cause major stress with noise pollution, and have a huge environment impact when manufactured.
Their infrastructure destroys nature, ruins neighbors and public spaces, exacerbates wealth inequality, and prevents healthy urban density.
Radical political ideologists love the Fediverse and always have, be it anarchosocialists or confederates. Not sure why. I just want shitposts and tech stuff.
Great idea, and because they are pretty straightforward tunnels it would be cool if cars rode not on the pavement but in some kind of structure that keep the weels on track and lesser the friction. The cars could also connect one with each other, so the cars on the back are not affected by the wind resistance turbulence created by the first car. Eventually, only the first car would need a driver (or in a crazy futuristic scenario, being self-drive) and for easy connections with the city some stops can be added on strategic locations. Being this a service thatbis more suitable for metropolitan cities (digging tunnels are expensive) we should call this system Metro. What do you think? Pretty bold, but maybe in the future someone build something like this.