Yep, a lot of people around the world either collect, or create their own police cars, and keep them, and then they travel around, bringing them to shows. There are all kinds around the world. A lot of people will take old police cars from major american cities, such as NY or LA, and restore them to how they originally were. I have also heard tell of others who have taken old cars, and painted them, added the insignia, lights and all that, to recreate cars. Then of course there are the ones who make their own with schemes from other departments, like the Dutch LAPD Smartcar