Thanks for posting the video link.
You are welcome.
The theory is that Tiger started moving into these S-curves going down hill to cause him to exceed the control necessary to stay on the road. In that situation, he hit that median strip; wiping out the sign as his car went into the oncoming traffic lanes. Then he went off the road, missing a huge tree but did wipe out a smaller tree that caused the car to flip over end-for-end to rest on the driver’s side. Do you suppose he did it because of excessive speed or an effort to miss a car driving on the wrong side of the median strip? The distance that sign was thrown would be a clue to his speed. That there were no brake tracks says it was a instantaneous loss of control. The place where he lost control was near a huge set of trees where their shadow could have obscured the curve in the road, or an oncoming car on the wrong side of the median.