[macp]

Why underground? Could it work in above ground pipes? How big would be the packages and robotic vehicles?

Packages, grocery, and food bring different requirements in terms of delivery speed and size, which could lead to different solutions--some easier to address than others. What is the pain point and most desperate customers for each?

[gitgud]

I agree, tunnels below ground have the disadvantages of:

- expensive to bore out

- cannot be changed

- expensive to maintain

Above ground pipes would allow for easier maintenance and a much cheaper roll-out. Crazy but could be worth looking into existing infrastructure like power cable routes etc..