If you email me at john.dexter@fsmail.net I''ll tell you a little about what I do, and/or remember you next time I have a demo to test. Currently I have a 3d terrain (based on a heightmap of sorts), realistic physical bodies which respond correctly to forces, and a box resting on four springs which responds like a springy block of ice (no friction yet). Next to add is tyre contact/steering so it acts like a wheeled object. This shouldn''t be hard. Then I might send it out as a tech demo before either getting a proper drive system or a semi-decent car model.