Ok, a couple of things ... I think I have bridges now, and the pitwalls have now got the Rolex ad.
There is give and take in the later ... because the same texture is used both
inside and outside the pits it will look wrong when in the pits - too big, inverted etc.
If you can cope with that, then keep it. If not, delete the
barriers1 file in the default folder.
Nope ... can't get it right ... taking out