Analysis by the safety body indicated that "driver error is the final failure in the chain of events leading to more than 9 out of 10 crashes." Of those crashes, self-driving vehicles would only be able to avoid about a third. "It's likely that fully self-driving cars will eventually identify hazards better than people, but we found that this alone would not prevent the bulk of crashes," said Jessica Cicchino, the IIHS vice president for research and also a co-author of the study.
As part of the study, 5,000 police-reported accidents were investigated. The driver behaviors that caused each crash were divided into categories such as "execution and performance", "incapacitation", and "sensing and perceiving". The researchers envisioned the same events leading up to these accidents, but removed drivers from the equation and used only self-driving cars to plot what might happen.
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