I'm of the opinion that if you really want to train FSDb on edge cases, the Northeastern US metro areas are where you need to focus. As far as sh*tty road designs and aggressive drivers go, the entire region has an abundance of both.
Chucks UPL is essential to get right, but that kind of maneuver is child's play compared to some of the sh*t we're forced to do in the Northeast.
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During evening rush hour, most people entering this rotary are trying to cross the Boston University Bridge. Notice how 3 lanes (1 from Mem Drive, 2 from the rotary) merge together and immediately drops to a single exit lane. To make matters worse, that single exit lane to bridge has a stoplight, which logjams the entire rotary.
In summary, 3 lanes merging into 1, and that 1 lane is frequently stopped by the light. How do you think FSDb will handle that merge...........
Also, when the entire rotary is logjammed, and everyone in the rotary has the right of way, what's the likelihood of the Massholes in the rotary letting in a car willingly? FSD will sit there forever and never wedge itself in.