Can't wait to feel the road

Looks damn incredible to me !
I just though that perhaps it would be interesting and good idea (if doable) to make AO objects under cars, rocks, and by concrete bariers.. something like that. Like Fat Alfie has done for his track, it is really good idea IMO.
I also see that trees has some "mirrored UV" thing going on. Eventually if you'd ever plan to do billboarding trees for trees that are close it wouldn't be an issue. I used to do this mistake myself. It is huge job to redo them, might not be worth it, I'd just rotate the most obvious ones to the good side.