This may sounds stupid, but can you not simply use ‘the Ai move to’ node, set the destination, then redo it with a new destination to kind of map out waypoints for the car? It is a boring and slow workflow, but I would say that would be a vary simple way of setting up way points for a car Ai. I can’t say I have ever made that, but I did something similar with my zombies, except my destination would be random within an accepted radius.