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Yes, you could give them rails to make them more efficient.

And how exactly does that solve the last mile problem?

We can offload to trucks driven by humans well suited to driving the intricacies of city traffic.

You could just run them on narrow strips of metal rather than bother with a wide stretch of tarmac that the wheels wouldn't be touching most of.

Great idea, then we can put rails on those roads to make them easier to navigate.

Why would we need special roads when we could have truck drones fly over traffic to their destinations?