I started collecting movie and TV models in 1/18 scale in 2003. The first model was "Bandit's" Trans Am, followed by the DeLorean from "Back to the Future".
To date I have about 250 vehicles, including some "unofficial" cars that were used in a movie, but not produced as licensed model. But I’m just collecting cars that are actually used in the film. No "1-second-in-the-background-cars".
Even motorcycle models in 1/18 and 1/12 scale are part of my collection.