Second, the point is that the first part of your claim -- speed alone causing a crash -- is not possible with the rules of the road which exist in the US, and many other countries.
Correct me if I'm wrong here, as I'm certain you will. You were the one that stated that speed alone would not cause a crash. I disagreed with that statement. Now, you're stating that a crash due to speed alone is not possible within the rules of the road (i.e.: speed limits).
Well,
duh.
If you're obeying the rules of the road, you aren't speeding. Speed limits on public roads are set with the skill of the average driver, the mechanical ability of the average vehicle, and the average conditions of the road taken into consideration.