This looks really complicated, I love being new at stuff, gonna take me a minute to figure all this out, I'm unsure exactly what behaviors you used on the vehicles, I assume LJPotential, Car, and Solid, but they don't appear in the actual behavior editor, maybe it's an advanced thing I'm unfamiliar with lol.
As for the waypoints, I found the template that inserts arrows into the pathfinders path that the player auto follows, I could use that same logic to create waypoints that follow the logic used by your waypoints system. The mapping for my first attempt will be mainly grid based, so north/east/south/west direction.
I'm going to be building the main traffic flow on events, and using your system for special events like racing and such.
I think I have to take a step back and figure out the objects you've used so I can emulate this, unless I can reverse engineer this I'm learning nothing, even the layout of your objects seems more advanced then I'm even aware of.
Either way, I believe this is perfect for my project with some workaround to create instances of the waypoints along a pathfinders path. Thanks for your assistance