Lakeside Montana had a 1995 Crown Vic cruiser that was used for patrol for 13 years, and 15 years as a speed trap decoy with a mannequin appearing to be running radar in the 45 zone, where most people are doing 70

https://www.thedrive.com/news/montana-town-finally-retires-its-1995-ford-crown-victoria-police-car

https://dailyinterlake.com/news/2022/sep/11/after-more-decade-job-decoy-cop-car-heads-retireme/

https://nbcmontana.com/news/local/decoy-squad-car-helps-reduce-traffic-speed-in-lakeside_2016050918571684