maybe you should use a script fitting your game, not just some random script
i could send you some code for vehicle driving but it won't work
try to do it yourself and don't copy protected code!

Aum 88 has a really nice working example for this, just try to understand it and do it yourself. it isn't that hard...
http://www.coniserver.net/coni_users/web_users/pirvu/aum/aumonline_e/