How to make your car turn. (really cool!)

This is really cool! In this tutorial you will learn how to make your car turn and accelerate.
Here are the codes I used:
Code used in keyboard up event:

{
  if (speed < 8) speed = min(8,speed+1.6);
}
Code used in the keyboard down event:

{
  if (speed > -8) speed = max(-8,speed-1.6);
}
These are the really in portent codes that we used in the video. You should play around with the values a little to make them fit your purposes. These codes can be used in many many ways. If you have questions just let me know.