Arrow keys to turn/move. How fast you can turn is determined by how fast you're driving.
This is a scrolling project we made for others to build theirs off of. Try to park in the little parking spot. If you're going too fast, aren't completely on it, or are parked backward, it won't work. If you download it and run it in non-presentation mode, it's a bit jerky, but it's really smooth in presentation mode. If you want you can download it and make your own project with it. (Hint: Try to stay away from the edges.)