searching help to rework road mesh

[tommm]

Hi together,
i'm on the way to convert my Hillclimb-Tracks to AC, and i try to rework the road mesh for a better physic. I found this tutorial (Road mesh tip) but i cant realised a proper solution. I have no experience with Blender, i install it only for this work. I hope that someone can help me, but its hard for me to discribe my problems in englisch, so i prefer help in german.
Thanks
Tom