Originally posted by RSTPerformance:

If you hit tire to tire it is the car being overtaken who is at fault. If the tire mark is up past that rear tire it is the car being overtaken who is at fault again. That is the way the rule should read.... if there is a tire mark on the rear bumper then it is the guy trying to hard IE the guy trying desperatly to overtake the guy in front.
I disagree. It depends on who had the option of avoiding the incident to some extent. If I am on the inside and already up to the edge of the track, I can't 'give' any more track. If you are on the outside, and almost in the dirt, then you can't 'give' any more track.