Hi, I don't know if it was meant to be like this, but I have 2 working AI lines actually in my track. It was a mistake by myself but I think you can do some trials. What I did was recording an AI line, but I touched a wall and went back to pit before the finish line, start a new lap right away and reached the end. Got out of the game, saved the AI line and now I've 2 lines saved for half track. AI is reacting quite well, automatically following first or second line, and when they reach the end of the first one they slow down (because I was slowing down to restart the lap) and gets on second line path.
I think if you find like a slow turn you can stop the recording while going, get back to pit, register another AI line, get back to pit, etc.. You just don't have to cross the finish line until you finish your lap.
This is easy to do in my track since it's a point to point track, but if you tweak pit position to do the AI recording you should be able to do the same in a circuit.
