Our track is 1/2 plywood tapconed down with a layer of ozite for the on road guys and another layer of indoor/outdoor carpet for us off road guys with most of the jumps made of 1/4 hardboard. The 'walls' are 2x4 hollow square plastic that you can drive over easily if you wanted. Its pretty car friendly from what I've seen, I'm hard on cars and haven't broken in a couple months now.
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