If you need to create road in 3ds Max that winds through the mountains, here you can see several ways for its creation.
Terrain Conformer – create road in 3ds Max through script
The first method is through a script called Terrain Conformer. You can download it from Scriptspot and see how to work with it from the video below.
Road conform – modeling a road in 3ds Max
The second way is “clean”, without using any scripts. This method was presented by Xoio and offers a greater control over the shape of the road after its placing on the terrain. More information you can get from the video, they have done.
Viz-People`s method for modeling road in Max
In Viz-People`s webpage I have found another way of modeling road in Max, again without using any scripts.