My car pops out of the world

I began to make a small racing game today, just to learn how to use ingame animations etc better. My problem though, is that when I play the game, the car pops out of the world. I’m attaching the file here, and hopefully some of you would look at it, and tell me what’s wrong.

http://files-upload.com/files/676397/racer.blend

Thank you.

Well, I fixed it. Only needed to re-parent the armature and the car.