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that depends on whether the supervisor needs to be in the vehicle or can "supervise" 10 of them remotely

Ok but what happens when the supervisor determines that a vehicle halfway to its destination cannot meet the requirements?

I guess sending out a human driven shuttle.

That would work fairly well in a "campus transport" system, where the nearest human is not terribly far away.

These systems are already there in small spaces (with 25km speed limit)