I live in London, and it’s very walkable and dense here compared to most US cities. Nevertheless, almost every vehicle is a delivery vehicle of some kind. Uber

I live in London, and it’s very walkable and dense here compared to most US cities. Nevertheless, almost every vehicle is a delivery vehicle of some kind. Uber Eats deliveries and Amazon packages going everywhere all the time. Some sort of city-wide underground packet switched (literally) delivery network sounds sadly impractical but would be amazing and take a huge amount of traffic off the road.