Your track looks very interesting, thanks for sharing the news.
IMO I would like to see some changes in track width - this could make it more interesting. Maybe even couple track cambers need more attention Also, at some places, there is some angle between road and roadside - this causes not nice line (visually). That's because you use separate materials/textures for road and roadsides (which is quite obvious with BTB). Maybe you can smooth the edge between road and road border a little (manipulate with points in road shape sections)?