time is a straight line. the circle is only for the easing of the incomprehending mind
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Building railway tracks to achieve universal coverage for the entire US without be a massive undertaking that would require a huge effort over multiple decades. Compared to that, building self driving cars is downright trivial. Let's not forget that they exist already, albeit in limited areas. People should not let their (justified) anger at Musk blind them to reality.
So bike lanes but for cars. What could go wrong.
Trains don't self-drive, though.
Edit: Okay, for the pedants: most trains don't self-drive.
Someone has never been to most airports. Or Disney World.
That's not most trains. Those are highly specialized and constrained applications. There are already self-driving taxis in certain defined city areas, so they're still ahead by that standard.
DLR trains do, and several airport trains.
Some London Underground lines have drivers that only intervene in the automatic operation of the train in an emergency or abnormal condition.