4k preview: https://youtu.be/NfCHWFEIQXw 

The single-lane dirt road is made using a seamless material with displacement.

PBR Material is applied to any plane (road) with a width of about 2 meters and corresponding UV with a tile size of 2 * 8 meters.
faces: 512
High resolution seamless textures:
Diffuse color SpecularMap-2048 * 8192px
NormalMap (input gamma 1.0) DisplacementMap (openEXR 32-bit height ~ 15cm) Ambient Occlusion Glossy-1024 * 4096px
Vray 3.1 or later Corona 2.0 or later.