Yeah, American speed limits are usually treated as suggestions. My usual commute is 70MPH, but traffic regularly flows anywhere between 80 and 85. I remember a chat I had with a cop a while back, and she mentioned that her go-to number was 13. So like at 12 over the limit, she wouldn’t bother. But at 13, she’d initiate a stop.

It meant if she recognized someone from a previous stop, she could just go “wait, I think I remember you… Didn’t I bust you for doing 43 in a 30 last time?” Their actual speed didn’t really matter, because she just used 13 over the limit every time, unless it was something egregious like twice the limit. That “wait, don’t I know you” line would immediately shut down any hopes they had of talking their way out of the ticket, because now they’ve been caught again and they think she actually remembers the specific stop.