A very small town on the northern outskirts of Nashville has been running a veritable racket on I-65 North for like 2 decades. Basically, I-40 crosses I-65 right in the heart of Nashville. I-65 then heads north through Kentucky, Ohio, Indiana, all the way up to Lake Michigan.
The interstates are generally patrolled by State Highway troopers. Somewhere in the early 2000's, little Millersville (TN) received permission to patrol the section of I-65 between the 2 exits that lead into their town (roughly a 6-mile stretch 15 minutes north of Nashville). The state approved it presumably because it meant the need for fewer resources from them to handle traffic safety in that area.
The town then proceeded to invest heavily in horrible officers and vehicles and basically tucked 2 squad cars there every weekday year-round during the peak travel hours of the day, to the point that this became an enormous piece of their budgeted annual revenues. Normally, most people wouldn't think much of this - after all, if you're doing 88 in a 70 and get caught, that's on you. The problem is that virtually none of this revenue has been used for civic improvement. The schools, roads, and general infrastructure in that little town are still an utter mess, and no one seems to be able to grasp where the money has been going other than back into the pockets of the local government employees and departments.
The karmic full-circle comedy from this is that one of their biggest investments several years back was to replace most of the vehicles they used to patrol the interstate with unmarked vehicles that blended in better in the median. That was an "oops," because pulling over vehicles as part of routine traffic patrol isn't supposed to be done with cars that aren't clearly marked in this area. As a result, quite a few drivers just stopped pulling over for these idiots. They just put on their hazards and drove on past the second Millersville exit, at which point Roscoe P. Coltrane had to exit and go back to town. Apparently, enough people did both that and complained to state officials, such that you rarely see them out in speed traps any longer. No idea what corrupt tactics they're up to these days to try to make up the revenue that they aren't getting as much of any longer.