I have an Escort 8500, their best model before the put GPS's in them but only use it on extended trips. I drive with the flow of traffic. If traffic is widely spaced, more than say a quarter mile, I keep it within 5 or so of the limit. I haven't been cited for almost 20 years. Keep in mind though, a radar detector isn't magic. A patrol vehicle just over the crest of a hill with instant on radar is nigh undefeatable.
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