I think you need protection for the cars from the mesh!
Don't hit em then
In all seriousness, the track has been designed to actually keep speeds down (apart from the main straight!). When cars do have an 'off', the speed and momentum is actually fairly low. The only part of the track that can take a fair hit is the middle lamp post when coming down the straight after the bridge. That bend can come up fast if you squirt a little too much power coming out the hairpin. When testing before comp night, that was one of the things I sorted by putting an extra row of rubber tyres in front of the cast resin tractor tyres. I know that tyre wall saved me at least once on club night!