Works well with limited human interactions over huge low population geography.
How get it to work though 5 thousand R R crossings.
That should be pretty easy. There’s not much a train engineer can do if someone is blocking the crossing but drive on through. It takes miles to stop a train.
I hate the idea of autonomous cars. I’m a lousy passenger and get carsick really fast if I try to read in a moving car. Plus I like to drive.
But stuff like trains or ships have lots of validity.