Consider the concept of asphalt trains discussed earlier (much earlier) in this post which involved powered freight wagons, powered with an electrical tether from the locomotive.
Now, replace the self powered cargo wagons with a mechanical power from the locomotive, but tether enough electricity to power steering servos on each wagon, along with the standard microprocessor.
There will be other differences, the diesel electric locomotive must have multiple, very wide rubber tires to spread the traction across the asphalt and avoid tearing up our highways. But the same concept holds, long trains, 20-30; possibly 50 car trains running down our major highways.
We still keep our constant returns to scale and any parking lot becomes a freight yard.
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