Walkable neighborhoods don’t remove the roads. They remove the *parking*.
Not only does removing the parking mean that you’ve saved an enormous amount of otherwise wasted real estate but you’ve strongly disincentivized people using their cars for trips that don’t really justify them.
You create a system where mass transit is far more efficient. The higher density means that it’s much easier to have functional delivery services for those who can’t get around as well.
You also tend to have a lot more mixed-used development. So you’d have a shop on the bottom floor and apartments above it to maximize the utility of both spaces (ground floor apartments tend to be less desirable, above-ground-floor businesses tend to be less desirable).
So the answer to your question is that they transport the heavier stuff the same way we do now: in trucks.
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