Lee Di Milia; PhD

1

• Lee Di Milia PhD
• Drive-in drive-out workforce
• Extent and implications.

2

• Overview
• On-shift safety is critical but . . .
• Safety is more than on-shift
• Funding to examine driving and SW Why?
• Number of risk factors
• Shiftwork Time-of-day Task
• Growth in 12h relocation effect

3

• Risk Factors
• Shiftwork
• Human biology is diurnal hard-wired Eg body
  temp cortisol melatonin mood performance
• SW disrupts synchrony pacemaker is inflexible ?
  conflicting messages
• ? sleep drive but ? cortisol body temp

4

• Health impacts of SW
• Physiological Psychological Social
• Sleep after NS ? 2-4h less than day
• Mood Impaired performance
• ? RT ? attention lapses
• Self paced work (Smith, 1994)
• Fatigue sleepiness

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2 Time of day
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• 3 Driving task
• Monotonous
• Boring environment
• Unforgiving roads
• Summary Sleep loss TOD Task
• Driving sensitive to sleep loss bio demands

7

• Evidence to date
• Long hours driving do not mix
• Medical students manufacturing
• SW 12h ? risk of fall asleep compared to DW
• lt 6h sleep ? driving impairment
• ? attention lapses, lane drift
• No studies of LDD SW

8

• Study
• Surveyed 1600 drivers Capricorn Peak Downs
  Hway
• Between 08 10
• Some 21 of traffic flow
• Work, travel and fatigue

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• Results
• Two excluded for BAC 0.05
• 12 SW Miners 93
• 30 4x12h NS 29 2x12 NS (Range 114)
• One-way travel 211 km (max 655 km)
• 19 drivers between shifts 581km
• One driver left at 0200 to drive 1300

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• Results

• 7 SW 19 NSW 1

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• Results
• 13 fell asleep driving to DS
• 23 fell asleep driving from NS
• Fall asleep linked with lane drifting
• Linked to lt6h sleep
• Return travel bi modal

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• Discussion
• Long distances driven post NS
• Some indicators of increased accident risk but
  none reported!!
• Simulator studies show 7 with increased
  accidents
• Seems that shift schedule drives travel pattern
• Expect DIDOW estimate to be higher?

13

• Solutions
• Education
• Sleep facility
• Modify schedule design
• Transport arrangements