Although there has been over 100 years of progress in recognizing and addressing the safety risk posed by human fatigue in transportation, 20% of recent NTSB investigations have identified fatigue as a probable cause, contributing factor or finding. This analysis represents the first-ever examination of fatigue identified in major NTSB investigations across modes and of the focus, recipients, and classification status of fatigue-related safety recommendations. It demonstrates that fatigue remains a significant transportation safety risk.
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