Thanx,
It's my first time adjusting textures... So don't expect miracles + it's not my track. It's from wgeuze.

(I hope he has some time to hobby again soon)
The road and the curbs didn't look to good IMO. So played around with it.
I agree with the 2 points.
The grass and gravel textures... Tile-size is to small or something... Don't know how to fix it.
The astroturf: i think i do something about it. But it's 1 texture for all corners, so it's going to be a compromise.
Zolder is a very active track. Every week there are track day's and events with cars, motorcycles, go-karts a few times a year trucks.
So the track is very worn and rubbered, but different every week. Curbs, white lines and astroturf is very rubbered and worn. To do this in-game with a clean road texture looks a bit weird.
rF2's philosophy is to create a "clean" track and let the realroad do its thingy.