Hep,
In two other independant studies, one by the National Transportation & Safety Board and the other by the National Basketball Association, also determined the .04 determining factor.
Actually in a funny moment a couple of years ago a poster argued that the .04 was silly because he could "see" what happened at all speeds.
As Peter has commented it is not the "seeing" but the brain's ability to determine the order of happenings when we hit the .04 area.
KindaSorta reminds me of the MLB "checked and unchecked swing" study.
Tee
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