If you get a ticket in a prima facie state, the law allows you to argue in court that your speed was reasonable and prudent given the conditions. If you can prove that driving the exact speed limit would have caused a hazard, such as cars dangerously swerving around you, a judge may well dismiss the ticket because your behavior was safer than following the literal rule.
Let me break the law because everyone else is. See if that holds up in court.
It won’t, but in the US it’s best to drive smoothly and safely with the flow of traffic. In most places that is over the legal speed limit.
It’s like a school of fish where one gets picked off by a radar speed trap as a sacrifice to the group to keep on swimming as-is.
If you get a ticket in a prima facie state, the law allows you to argue in court that your speed was reasonable and prudent given the conditions. If you can prove that driving the exact speed limit would have caused a hazard, such as cars dangerously swerving around you, a judge may well dismiss the ticket because your behavior was safer than following the literal rule.