Now there are people out there who love cars AND roleplaying, so why not add a few mechanics for roleplaying? I’d add to the fun of the game but maybe not so much where it makes it a 50 - 50 between roleplaying and a car themed game.
Maybe add a police mode to cars, the most that can be done with that is added police lights, but there are the front and back rams of police cars, but just so people aren’t rolling around in police cars just make the rams either non-colidable or have a weaker strength.