That's true currently— but I think you're neglecting the possibility that widespread use of robotic cars could effectively eliminate rush hour. If that hour and

That's true currently— but I think you're neglecting the possibility that widespread use of robotic cars could effectively eliminate rush hour. If that hour and a half commute starts taking the twenty minutes it should, two hours is time for a bunch of round trips. Of course there will be some limit to capacity, as with any public transportation. But having to wait a bit for a car isn't going to put off commuters who are used to spending hours a day waiting in traffic.