On the Burned Forest map, beneath majority of main asphalt road a texture of solid rock (stone_test) is used, it looks, umm weird and unnatural. I know the limitations of 4 materials per chunk, so one would think it is done this way so save resources by using the same texture used inbetween rock models, but that texture on those chunk isn't really used that much, I'd propose to see if a gravel texture looks better (or one of Kuban's ones) or remove it entirely from beneath the road and just leave it a dirt texture.