Personally, I can think of lots of edge cases that will be interesting to see answers to. For instance, a 4-way stop - we know how to handle that easily, and can overcome someone jumping out of turn, again, quite easily.
More importantly - who will be maintaining all the traffic changes? An example - a section of Interstate or road is closed for months, whether by damage or construction. And then, when it's clear again?
I'm interested in seeing how these things play out.
The 4-way stop was something they had to change from the ideal setup. The google car was obeying the law and waiting its turn and never getting it. They made it get more aggressive the longer it waits and now it gets through them just fine.
More importantly - who will be maintaining all the traffic changes? An example - a section of Interstate or road is closed for months, whether by damage or construction. And then, when it's clear again?
I'm interested in seeing how these things play out.