There is one small tutorial in www.shinedraw.com
about driving,which simply goes forward and backward and so on.
Further you can buy Actionscript3 Game Programming University by Gary Rosenzweig,which contains various informative things about games including racing also.
Further log into this website and download the sources of book and racing game illustration is in chapter 12
Further,it is a great book for every flash programmer to buy and study and thanks to effort of Gary Rosenzweig