Comment by AlotOfReading

Several months later, the state changes the speed limit on the street without changing the ticket check. Some time after, traffic authorities add a bypass road or a fast lane to deal with the new traffic problems and forget to update the timings. Then it's reported that a rural municipality set timing thresholds just below the speed limit to cover budgetary shortfalls.

Eventually the camera manufacturers offer "easy setup" systems that dynamically adjust based on actual journey times. This works fine until the first office holiday, when the routine congestion is gone.