That may be true if you can eliminate human drivers from the picture. I'd be shocked, though, to see numbers that support this being feasible at that kind of sc

That may be true if you can eliminate human drivers from the picture. I'd be shocked, though, to see numbers that support this being feasible at that kind of scale on public access roads. And that just brings you back to needing some sort of separate right of way for transit -- sure it's potentially interesting and useful, but it's just another alternative form factor for transit as it exists today.