Gravel Traps
As far as i can see the best form of arrestor is good old tarmac, one of the things a racing car is (hopefully) good at is sticking to tarmac.
A possible solution would be to have a strip of grass at the edge of the track, and the rest up to the armco to be tarmac (coloured green if they want).
Have some of the superspeedways done this already?
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