i worked a bit on my track, it is a very dark track
and i made some other experiments too:
playing with diffuse/ambient/specular value (could be used for a cool track, scenery "other")
sandstorm in dark track: (could add colorable sandstorm particles or at least black ones for blackdesert scenery (want to add this effect in my track))
and playing with specular again:
and just for fun: factory without terrain: looks very funny