As to the wall vs sand trap...I prefer the walls.
I've been wrecked more by people getting a tire off on exit, hooking the car, overcorrecting and ending up 90 degress to me across the track...then I have being wreck by somone hitting a wall, most of the time people just stick it in the wall and slide along it...
I've been wrecked more by people getting a tire off on exit, hooking the car, overcorrecting and ending up 90 degress to me across the track...then I have being wreck by somone hitting a wall, most of the time people just stick it in the wall and slide along it...