[quote=AN]If every car is autonomous, I’m sure it would be safe for every car to be traveling at >100MPH, since they all will know where other cars around them are and where they’re going, so there would never be any surprise.[/quote]

It might be safe but it wouldn’t be efficient. Cars traveling at 100+ mph use up a a lot more fuel/energy than a car traveling at 55 to 65 mphs. Autonomous cars should be able to draft better though.

As for high speed rail. I like the idea of it but I don’t know that the cost of California’s project is worth it. Last I heard the project was going to be over $100 billion. That just doesn’t seem to be worth it.