I would be surprised if they setup their system in a way where they can't tell a car to approach a red light by using less fuel than human drivers use.
As far as accidents go, the idea that automatic breaking should take over in emergency situations is already implemented in many cars on the road. It's unlikely that the system would react how a human driven car would have reacted a decade ago.
If it's worth saying, but not worth its own post, then it goes here.
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