[senko]

I'm also wondering about how portable the machine learning for the self-driving cars are.

Driving around, say, Europe, differs in subtle but important ways (no right on red, different on-pavement and side signaling, etc.) that it looks to me like they'd have to re-learn many of the aspects.

For example, Musk recently commented about how the Tesla car recognized what a valid parking spot was. That's totally dependent on location (country).