[sebbi]

I don't think busses, self driving or not, could ever compete with high speed trains. I have yet to see a bus driving 220 mph on a street crowded with other cars, busses and trucks.

And that will be even more true if the US decides that 220 mph is too slow (because it is just as fast as everyone else) and they might want to skip that milestone and go for 350 mph maglev trains ;-)