Thanks for sharing, Normk; my critique and analysis relates to the study only, not in your presentation in any way:
Interesting, but . . . without the MAGNITUDES of the impacts, their mere DISTRIBUTION does not inform as fully as it might, IMHO.
Further unknowns: Sample size (number of crashes investigated), environment of accidents (i.e., highway, street, off-road, track, racing, motocross, etc.).
The Hurt Report (referenced by the speaker in the video clip) remains definitive, I suppose, unless possibly the new government study (performed at an Oklahoma university) has been completed and released.