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Human Performance

Human Performance. Deborah Bruce, PhD. Driving Experience. Part-time driver since 2001 No traffic violations School bus driver 2000-2005 Excellent pre-employment reference One past motorcoach accident Third trip to Florida for Bluffton. Driver’s Work/Rest Schedule.

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Human Performance

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  1. Human Performance Deborah Bruce, PhD

  2. Driving Experience • Part-time driver since 2001 • No traffic violations • School bus driver 2000-2005 • Excellent pre-employment reference • One past motorcoach accident • Third trip to Florida for Bluffton

  3. Driver’s Work/Rest Schedule • Off-duty 12-day period • March 1st on-duty 10.5 hours • Arrived in Adairsville, GA, at 7:37 p.m. • Began driving at 4:30 a.m. March 2nd • Opportunity for 7 hours of sleep • Driving an hour before accident

  4. Fatigue-Related Accident Factors • Duration of last sleep • Total sleep in past 24 hours • Split sleep/work pattern

  5. Driver Medical Information • Expired medical certificate • Recent visit to primary care physician, but did not get medical exam • Risk factors for obstructive sleep apnea, but had never been tested • Not impaired by alcohol, illicit drugs, or narcotic pain medication

  6. Accident Trip • Traveling in HOV lane at est. 65 mph • Not using telephone or CB radio • Road conditions were dry • It was dark at 5:38 a.m. • Roadway lighting met current design standards • Headlights were likely on low beam

  7. Driver Expectancy • Driver expected I-75 HOV lane to diverge to the left • The driver did not expect a left interstate exit • Primary lane following cues were • yellow edge line marker on the left • double white line on the right • repeated diamond road markers

  8. Route Following Mistake

  9. Failure to Stop Factors Affecting Perception-Reaction Time: • Low contrast – nighttime conditions • Older age • Object size • Driver expectancy • Visual complexity • Driver experience/familiarity

  10. Driver Error • Route following mistake takes him up the exit ramp • Failure to decrease speed ignores road elevation cues • Failure to stop even with STOP AHEAD signs

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