Speed traps in the US. I had to explain to my son that the reason why we have to drive 45 mph for half a mile on an interstate is because there is a convenient side street in the middle of that stretch of road where the police can wait.
I actually appreciate cops keeping people to the speed limit. It is much safer for everyone.
Edit: While I appreciate cops doing this, I actually think it shouldn't be their job. We have meter readers handing out parking tickets. I think non LEO civil servants could issue citations for speeding too. That would free up cops to be arseholes somewhere else.
Sure, if the town didn't suddenly drop the speed limit for half a mile right as it goes around a curve that gives the cops a place to hide and give out $20 tickets with $200 court costs that people pay online. I don't know for a fact, but I'd bet money that the court costs go to the town (and from there to the police department), while the fine itself goes to the feds. An abrupt 45 mph zone on an interstate doesn't protect anyone, it lines the pockets of the police department that has jurisdiction. It's fucking predatory.