When my city-raised son was two, he’d scream bus! with full-bodied delight whenever he saw one. It’s quite possible that his yet-to-be-conceived youngest child won’t learn that word, nor ever ride in a “taxi,” “shuttle,” or “vanpool.” These fine gradations for types of shared vehicles will disappear much like telephone booths from city streets — and not to be replaced by the likes of Zipcar, Car2go, or Lyft. Rather, it is the fully autonomous car that is going to be game-changing. But it is a future with two trajectories: heaven and hell.
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