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It looks amazing, and by the way http://www.youtube.com/watch?v=3f6INgYBmGo this might come in handy.
I find it difficult to stop the car without turning on the parking break, because there is no true break. When you hold down arrow the car stops...
Since you brought up crash testing, I think it would be really cool to have a map that tests cars strength. Such as a huge metal swing kind of...