Once. But where I live I never see taxis. The hurdles will be solved if the market for self driving cars is there.I don't disagree, I just think we have a LOT of hurdles Have you ever seen a clean taxi?
Edit to clarify:
I don't disagree, I think a lot of those hurdles are legal. But if there looks to be good profit it will happen. I'm not saying overnight, but sooner than a lot of people seem to think. The transition from cars to horses was slow at first, then came Henry Ford and things sped up quite a bit...and there are still uses for horses even now--I think the move (starting from now) will be along the same lines. First see limited uses like we already are: shuttles, convoys of trucks with only one driver, soon taxis and eventually older cars will just start fading away.
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