Currently, vehicles are just... well, sadly not something anyone's been able to pull off right yet. But who knows? After the X9 migration is all done Lee just might do something like that... after all, in the "FPSC Classic And Beyond" thread he
did say:
Quote: "We are really excited about outdoor landscapes, vehicles, flying machines and more physics than you can handle. We want to empower you with the tools you need to create amazing games, so watch this space for more sophisticated models and great new features that are both X9 and X10 compatible."
...So I'm never gonna loose hope! Vehicles are personally one of my most wanted features to the engine... always has been. I don't know why. Just has.