Invert the Y. On the left fork, we have traffic on the 51 at highway speed, though this lane has just come in off the 202 and has not yet had a chance to change lanes into a leftmore lane, because this lane is about to terminate in an exit. On the right fork, we have traffic coming off something else, not quite up to highway speed yet but getting there. We have several cars and not much room in the left fork. We have, appearing out of damn near nowhere on the right fork, about 5 cars that are going to have to not only merge with the left fork, but also get the hell out of the exit lane before it finally does exit. My one panicked reaction was a hurried contemplation on the law of physics that states that two objects may bloody well not inhabit the same space/time as each other, and the observation that the two clumps of cars were about to attempt just this, with inertia and concrete reinforcing the matter.
I'm not sure what the hell happened, but Dagger says it was a really simple thing of figuring out where we could and couldn't go and then going/not going there, but no one got squished. I'm foggy on the details because it was her driving at that moment, and she didn't consider it important enough to save.