There are not so many free racing flash games out there. This one is not truly revolutionary but nice. Note this interesting feature, the "ghost car" which you can race against as it shows how you got round fastest last time. Arrow keys to drive, Spacebar to brake, P to pause, and Esc to quit.
Keep an eye on the map in the top right as the visibility is not very good, and use the brakes to avoid going off the course.