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Adding to what @strongbad had said, you also have other complex issues to deal with as well... For example, if it is hot outside, you can be as little as 50-100 yards from the road (or less) and no...
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Adding to what @strongbad had said, you also have other complex issues to deal with as well... For example, if it is hot outside, you can be as little as 50-100 yards from the road (or less) and no...