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Driver Performance Due to Head Congestion in High Altitude Trip

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  1. Human Performance Dennis Collins

  2. Human Performance Issues • General information • Driver’s head congestion • Accident trip • DriveCam II data • Summary

  3. General Driver Information • Valid license, years of experience • 71 years old with valid medical certificate • Obstructive sleep apnea (OSA) in personal medical records • Reported head congestion in the 3 days prior to accident trip

  4. Driver’s Head Congestion • Runny nose, head congestion • Driver believed he had cold • 7,000+ foot altitude change • Consistent with altitude sickness • Congestion interfered with use of CPAP device while in Telluride • Sleep quality poor

  5. The Accident Trip • Awoke 6:45 a.m., began trip at 3:15 p.m. • Stopped to remove chains from bus • Interviewed passengers said: • Drifted onto shoulder • Steering caused objects to slide • Passengers concerned about speed

  6. DriveCam II System • Forward view • Audio • Forward/lateral acceleration • Interior view • No hands, steering wheel • 20 seconds (10 before crash)

  7. DriveCam II Interior Video • Cannot tell if driver showing signs of fatigue • Two steering inputs to the left • Objects in motorcoach move and passengers react • Driver only reacts as crash occurs–after passengers

  8. Summary • Reduced quality sleep 3 nights prior to crash • Long day with long period of vigilance • Vehicle’s excessive speed • Reduced situational awareness • Slowed/delayed reactions

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