Now the roads deform the terrain to insure camber is level. It tries to smooth the terrain too, but can’t enough to keep on top of the terrain. I think I will have to add center points to the road segments so that it can be higher definition than the terrain. It took having the road resolution be at least 2x terrain resolution to stop having terrain break through at the midpoint of a segment lengthwise on the road… but they still can poke through widthwise. Combine that with better smoothing the terrain lengthwise on the road and flattening intersection areas and maybe the road will stay on top.
Just want to say this looks amazing 
Sorry for my delays, I hope to finally catch up with all forum threads from July soon.