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I don't know why but I was surprised to watch it execute a 3 point turn to get out of his lane way, seemed very human like hehe.
Right. Because they have been refining this system for ten years. And the last few years they have had actual customers giving lots of feedback and a lot of the tweaks I assume were about making the driving more human.

That turn does seem to me like one of the tweaks you would add a little further on though. But I don't know because almost from day one it would need to be able to plot _some_ type of path there.

They encoded turning-on the warn-blinkers when stopping for arbitrary reasons, including picking up a passenger? Do they also perform rolling-stop and honking when passengers are late to arrive or as a way to say good-bye to those left behind? I think their AI picked up the bad habits of Californian drivers too.

(actual course seems to have been in AZ)

Overall, this is quite impressive though.

I mean, it makes it obvious where the car is and they may sometimes need to stop somewhere that they technically are not supposed to be stopping, and the warning lights make it if not less illegal then less likely to be ticketed or cause a collision.

This is not a "course" really, it is like a 50 square mile normal suburban area and the cars go where requested. There are controlled courses for testing such as the former military base that is closed off and has fake scenarios thrown at it.

But this is a service operating in normal neighborhoods.

I'm impressed at how robust the service (in addition to the driving) seems to be. This is very exciting to see.
I would love to see how it behaves when the speed limit is multiplied by a factor of two or three while ignoring red lights. I suspect it would go pretty well.