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If you can't prep your berm surface to look like Knoxville (packed, with moisture and the same material as the track) then it can be much worse having the dust and marbles thrown onto the racetrack, as soon as that happens then everyone has to go down there which makes a single lane no passing marbled dustbowl.
Why hasn't anyone tried going the opposite way and dig an 8" deep trench instead of a berm? Nobody will purposely run it down there to unload the RR, throw junk on the surface and keep overwatered mudholes off the bottom lane of the racing surface.
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