My hypothesis: the directionals in V12 go on based on angle of the trajectory, and ignore navigation info totally.
If anyone immediately knows I'm wrong, please share. And ignore the rest of this post.
I've been testing my funky intersection down the street (anyone from L.A. remember Seymour on Fright Night, heading off to crash the party down the street?). This is the one shaped like the Greek letter psi:
Intersection
www.google.com
If you're heading toward the intersection on Forest St. and go "straight" across Rt. 114, you'll be heading up Essex St.
I haven't seen it handled correctly (for some loose definition of "correctly") since V11 maybe. The first wrong thing that happens is the left directional goes on. FSD knows it's going "straight" as per the nav, but it always turns on the left blinker.
What happens when the light turns green has varied, but it has never been pretty.
Coming back the other way has its own host of problems as well, but it consistently turns on the right blinker. Again, when the light turns green, any number of different things can happen, most of them ugly. It did make it once or twice onto the correct path, and I can't really identify why.
So I'd love for someone in the FSD group to know about this intersection, but have NFI how to get it to them. Maybe someone from there actually reads this board. No, I'm not holding my breath.
The actual reason I posted was to ask about the directional behavior. It seems to be based on intersection geometry alone. Thoughts?