Just north of Seattle, there are a number of small jurisdictions that strictly enforce speed limits, to the extent that they have reputations for being speed traps. One thing it did for me as a young just licensed driver was to learn to obey the speed limit, and where their favorite hangout were (and still are). When my son's friend got a ticket, they were both shocked when I said, "let me guess it was on the curve by the 7-11." They shine their spotlight up onto the streetlight to darken it, then sit and run radar, they've been doing it for 40 years...