Creating a New Track

In Unity:

1. File -> New Scene
2. Delete the "Main Camera"
3. Open the Projects tab in the bottom, open the "Prefabs" folder and drag the Car, GameManager, TrackController and UI (make sure you drag the blue cubes, not the scripts!) to your scene.
4. You should be done! Check the console for warnings, and then work on your terrain!

Adding track markers

1. Add as many markers (Trackmarker, the pinkish roundish thing) from the "Prefabs" folder as is needed, and add them as children of the track controller.

Notes

The Car etc. are stored as prefabs. Learn more at https://docs.unity3d.com/Manual/Prefabs.html