Speechless? Where I live we have full size public buses that are frequently only carrying one or two people. In fact if I had a nickle for every time I've seen a completely empty light rail train in the middle of the day in Denver, I'd be a rich man by now. Public transport in the vast majority of the US is a failure. In Colorado Uber and Lyft probably haul 10-100 times more people every day than ride our public transportation, that's not efficient at all. The main complaint people have is public transportation doesn't run often enough, or provide enough routes, self driving vehicles could fix that and make it economic for US cities. If you had smaller buses (sometimes called vans) you could run them more often and thus make them more appealing to the masses. Is it less efficient, yes, but if it gains more riders that's a net gain IMO.