system
Given the following post, respond as if you're commenting on Reddit:
human
What would happen if four of Google's driverless cars pull up to a four way intersection at the exact same time?
gpt
I saw a video about how the car navigates 4-way stops in general.  It waits its turn, and then goes if the intersection is clear.  If other cars keep bypassing its turn, it will start inching out into the intersection until other cars have to stop and let it go.

I figure that combined with a psuedo-random timer could easily allow them to drive through the intersection in your example just fine.