This is a sub-page of The Simpsons: Hit & Run.
The following cars are never seen in-game and cannot be purchased or driven. Aside from one fully-cut vehicle, all of these cars have functional CON files that make them drivable. They can appear as NPC racers in the bonus racing mini-games, and can be driven using the Unlock All Cars cheat after 100% completion.
Additionally, there is a Test.con, a testing handling file for a "ferra".