Track not always lit by head lights

Glad you got it sorted !

There is a lot of confusion about mapping channels. Shaders are limited to 4 sets of coordinates (0, 1, 2, 3), while most artists (all 3ds Max users until gJED) are used to working with mapping channels (1, 2, 3, 4). These are not the same things. For example, in the case of the Real Road Shader, the normal map is typically assigned to (Max) UV Channel 1 (low frequency diffuse map) or 2 (high frequency detail map), but these coordinates get exported as the third set (2). Internally, the shader works with those 4 sets of UVs, but to us (Max) artists it seems like there are only 3. Need more confusion ?

I think the easiest solution for other shaders would be to create a new post and ask if you run into trouble. In nearly all cases you should be fine though.