The Hurt Report - on motorcycle injuries
this excerpt is really interesting:
29. The typical motorcycle accident allows the motorcyclist just less than 2 seconds to complete all collision avoidance action.
in auto driving, you're taught to drive more than 2 seconds behind anything, because 2 seconds is the typical reaction time: one second to detect a problem, one second to determine and initiate action. This indicates that bike accidents occur outside the limits of human reaction time.