Not on any show Sniffs_Markers has ever worked on (or I have ever seen.) You can drive a “picture car” from the studio lot to the location. The only time a truck brings them in is if they are vintage vehicles that may not be 100% road worthy.
The picture cars are all licenced. Meaning they have proper plates insurance etc. They can all drive legally on the road. Our friend Danny is a driver and you see him puttering down the road in a cop car routinely (granted someof the cop cars are NYC cops, or Cooneticuit etc.) Any cop who saw the licence plate would know it’s a picture car right away ('cause they aren’t police plates) or could run the plates to see which production company owns the vehicle.
Fake plates are attached when they get to location. If the car is supposed to be from another geographic region (e.g. many “New York” shows are filmed in Toronto.) the fake licence plate is affixed by the props guys once the car arrives at the closed location. (If they are being sloppy, occasionally you can see an Ontario licence onwhat is supposed to be a yellow, New York cab.)
The police cars on the exterior, look identical to the real ones. The lights on top work too. If you look at the interior though, there’s none of the computer stuff, radio or any of that cool police stuff. The interior is just regular car stuff.
So how do you tell it’s not a real one? The average person probably couldn’t at a glance, but we always know when we see a picture car going to and from the lot because instead of a cop driving it, you see an ordinary guy wearing a t-shirt. (That and the picture cars are always WAY too clean.)
The film permits are very extensive so the city, the real police, and fire dept. etc., are fully aware of the comings and goings of the fake police cars. If they saw a picture car puttering around where they weren’t expecting it to be, they might pull it over.
Driving too and from the lot/location, Danny is not “impersonating a police officer.” For one, he’s usually just wearing jeans and a t-shirt, secondly, his career would be over if he ever decided to turn on the lights or siren off set and “pull someone over for fun.”
Note: This is in Toronto. I don’t know about NYC or LA, so YMMV.