[aeternum]

They would generally be single lane tunnels so no merge issues. Breakdowns would be rare since these are well-maintained but if one did occur, the fleet would be programmed so the car behind simply pushes the AV through to the next exit.

They could terminate to converted underground parking garages (cities already have quite a few) and with AVs the need for personal parking would be greatly reduced. People would have plenty of time to get in and out without blocking the tunnel.

It's actually insane that most trains stations block the track, how quickly would you fire the dev that insisted on holding a perf critical mutex while waiting on user input?

Building the tunnels does need to be automated but that's exactly what Boring company is doing.

Ultimately human driving will be banned within cities. It's just far too dangerous. It's almost as deadly as smoking especially in cities and the risk asymmetry is extreme: pedestrians and those around the car are in far more danger than the driver.