[NavMesh] What parts of the existing NavMesh can i use for a traffic system?

Hello there,

i haven’t tinker with the NavMes that comes along with the Navigation System, but is there something i can use to make a traffic system like GTA? So having multiple line roads, where cars decide to take the one for turning left, waiting the towards coming cars before turning left?

Otherwise i would need to create everything from scratch.

The thing is, the cars should be able to be placed outside of the road and still find the next possible road to drive to their destination. I know that i can set parts of the navmesh to be more “attractive” for NPCs, but is that easy enough to combine with this kind of system?