They get stuck in LA as it is which is pretty chill for a major American city all things considered.

They're just really cautious and do need an extra 10s to think sometimes, and there's a lot of driving scenarios that don't allow that much time to decide to go or not. The biggest culprit seems to be unprotected intersections with the potential for human/bike crossing, which includes driveways which they insist on using for dropoffs (even when they're obviously not public driveways), which they then take a very long time to leave.