Free: Contests & Raffles.
My guess would be the same distance required for shooting a firearm off the highway.
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Thats a good question. I'd guess it depends on whether your're shooting towards the road or not. If towards the road better make it a two hundred yards at least. If away then it may not matter too much 50 yards? I've never seen anything in the regs. about that...
I believe it's worded - 'maintained portion'. Get past the maintained portion of the road and you should be good as long as you're shooting away from it.