Nice long track with some variation. I'm quite fond of the trees you made (or used). The walls, however, made me feel a bit claustrophobic though. For me, they are too high, and the walls seem like they were scaled too much in that it makes me feel a bit like I'm driving an RC (radio-controlled) car on a full size track.
Track is more fun (for me) with LMP cars versus the GT cars of the Endurance Series from Enduracers, which is what I tested the track with.
Cheers