Do you know if Bristol has NightFx.Someone watched Nascar Bristol dirt race?
it was really extraordinary.
I wonder, if it's possible to make texture overlay of mud/sand on the track (same as skidmarks), and fix surface traction of the track. Also make some transparent layers in the upper outside part of the tracks and inner side of the track (in the corners) with difference traction to main part. Would be something like dynamic surface