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BTW which direction should the skid marks go?
That depends on the manor, of which the car ran of the track. Did the driver completely miss the curve and whent directly in to the gravel or did he enter the curve going way to fast and go sideways into the gravel. It's all up to you Tom. You need to become 6 years old again and play a little with that car and try to imagine how the car ended in the gravel.
The gravel would also be effected by a car going into it. The car would leave deep marks in the gravel.
You could try to Google for F1 pictures. You might find something usefull.
Just ask away if more help or info.