At our local dirt track speedway the poles are the same height as those,they plug in the ground and can be quickly replaced if damaged.
Although the fencing is only designed to stop tyres or debris flying into the crowd,they are not designed to stop a torpedo shaped car going over 200 mph from going through it.
The issue is what do you replace the netting on the fence with that is strong enough to stop a car,but doesnt restrict the crowds view?.
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