What's the point of having a B Zone if it isn't going to be cleaned up? You can look to almost any other racing sport to see how track boundaries are specifically designed to help mitigate risk. All auto racing tracks are designed with space on the outside of critical corners to give a buffer from hitting a structure, or if there is no room, the walls are specially constructed to absorb impact. Or look at ski racing, which takes place on these same mountains, and notice the layers of different types of fencing, and the pads on the trees...