In this video, you will learn how to use the Vehicle Path tool in Twinmotion. The path is first built using a familiar pen tool to draw points that create a path. With a path drawn, cars will begin to populate the path based on settings specific to the path. You should be able to create cars that follow any type and size road.
https://dev.epicgames.com/community/learning/tutorials/XXXJ/how-to-use-the-vehicle-path-twinmotion-2020