I guess natural would be best but thats not possible for a temporary track. I guess smallish diameter hose - but not small enough that people will shortcut across it to gain time.
I confess I really don't like those things they use at york. The stuff they used at oswestry would be ok if it was buried slightly but as it was it was similar to york. Neither are very easy to get over if you get stuck on the wrong side of the track.
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