4K video preview: https://youtu.be/9AEXt7FLKRA 
The single-lane dirt road is made using a seamless material with displacement. Red clay with stones and crushed grass between the tracks.

The material is applied to any plane (road) with a width of about 3 meters and a corresponding UV with a size of 3 * 21 meters.
faces: 5632
High resolution seamless textures:
Diffuse color-2048 * 16384px
NormalMap (input gamma 1.0); SpecularMap Opacity mask (for rough edges) DisplacementMap (openEXR 32-bit height ~ 7cm) -1024 * 8192px
Vray 3.0 and above Corona 2.0 and above.