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Actually, I believe there are standard recommendations, but what they are specifically, I don't know.
If I were serious about finding out, I would check the DOT website and some industy organizations, since they are the ones that tend to come up with such standards.
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"Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience." – C. S. Lewis
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