[tweedledot]

Sounds very similar to the existing road infrastructure.

[haltist]

The tubes prevent accidents, that is the main innovation.

[tweedledot]

You’re still going to hold up other people if you stop to chat or stick your arms out of the tube.

[haltist]

The AGI takes care of that as well. The tubes are reconfigurable so you can't be where you're not supposed to be according to the AGI's plan. Even if you're chatting the tube will suck you up and transfer you to the required destination.