Yeah. I was under the impression tht there's a 10% margin of error if you include the error of both your spedometer and their radar. I though that meant you'll basically never get a ticket if you're doing within 10% over the speed limit (so, 55 in a 50, 88 in an 80, etc.).
Or at least that's what I remember talking about in a Transportation Safety class I once took.
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