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What's the justification for spending on high speed rail vs roads vs air travel vs doing nothing (Google Car is coming, remember)?

Will the Google Car drive at 200 mph ?

No, but it will take you door to door, departing instantly when you're ready and not before, and it won't stop in between unless you want it to.

*citation needed

The congested road network still happens with Google cars.

Does it, even when cars movements are coordinated and all driving automated? How congested?

Regardless I would want to see a cost-justification of high speed rail vs auto vs standard train vs buses, etc.

And somehow magically the continuously overcrowded streets and traffic jams don't apply to the Googlr car? Have fun waiting in traffic..