Thanks !
Great tutorial. Really smart, really helpful and much appreciated! 
On additional question: I’ve tried to build up a scene with a car driving on a landscape. As long as I stay on flat plane everything work pretty good. In that moment when I’m using a surface which is not flat, or which is for example rotated around x- axis or y- axis, the car is starting to “wave” around the spline. Do you have an idea how to fix this. This would be really a great help.
best regards