It does not matter where to create the path - on the road or on the prefab. The main rule is to disable traffic on this section of the road or prefab.
First separate sections of the trajectory are created - directly, the exit, the stop, the entrance to the main road
![Screenshot_1.jpg](./download/file.php?id=8716&sid=347abbabcad062422c5fc03313349a9d)
- Screenshot_1.jpg (112.89 KiB) Viewed 1135 times
Then parameters are assigned for each section of the path.
![Screenshot_2.jpg](./download/file.php?id=8717&sid=347abbabcad062422c5fc03313349a9d)
- Screenshot_2.jpg (112.41 KiB) Viewed 1135 times
Then the sections are connected (the nodes are magnetized to each other)
In front of the connection of trajectories need to put additional nodes. The priority of this additional node extends to all nodes related to one section of the trajectory.
![Screenshot_3.jpg](./download/file.php?id=8718&sid=347abbabcad062422c5fc03313349a9d)
- Screenshot_3.jpg (166.53 KiB) Viewed 1135 times
The beginning and end of the trajectory should be as accurate as possible to the junction of roads.
Good luck