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One job or two?Truck driver work, sleep,alertness and performance
Hamish Mackie
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Work
(14 hours, incl
commuting)
Sleep
(8 hours)
Life: exercise, eating
recreation, chores,
family, community
(2 hours!!!?)
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Problem / Questions
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Study design
Initial meetings with operators and day with
driver to scope issues and task demands
Questionnaire (225 drivers, 16% of pop)
Anonymous information from operators used to
validate some variables (weight, hearing etc)
In cab half-day driver interviews (15 drivers)
Industry focus group for recommendations
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Key Findings
Obesity: Nutrition/exercise
Workplace injuries
Work/life balance (incl workinghours and fatigue)
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Drowsy drivers
0
5
10
15
20
25
30
35
40
45
50
4 5 6 7 8 9 or more
Hours of sleep per night
%of
drivers
drowsy now
and then
drowsy at
least "fairly
regularly"
25% of drivers report getting 4-5 hourssleep per night
15% of drivers report feeling drowsy while
truck driving on a frequent basis
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Log truck driver
sleep, alertness and performance
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0
5
10
15
20
25
30
35
40
45
50
55
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Day of Week
No.ofCrashes
Loss of control log truck roll-overs 2001-2009
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Purpose:
Describe the sleep patterns of log truck drivers
Determine whether sleep patterns are likely to be
contributors to early working week crash risk.
Considerations and purpose
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Study method
Two main stages of data collection:
1) Validation of a sleep diary using activity monitors (12
drivers, both sleep diary and activity monitor for 1 week)
2) A survey of drivers (45 drivers, 7-day sleep diary only plusquestions)
0
500
1000
1500
2000
2500
3000
7:22:00
8:01:00
8:40:00
9:19:00
9:58:00
10:37:00
11:16:00
11:55:00
12:34:00
13:13:00
13:52:00
14:31:00
15:10:00
15:49:00
16:28:00
17:07:00
17:46:00
18:25:00
19:04:00
19:43:00
20:22:00
21:01:00
21:40:00
22:19:00
22:58:00
23:37:00
0:16:00
0:55:00
1:34:00
2:13:00
2:52:00
3:31:00
4:10:00
4:49:00
5:28:00
6:07:00
6:46:00
Activity
counts
Time
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Findings
Night Time to
bed
(average)
Time asleep
(average)
Time wake
(average)
Total Sleep
duration
(average)
Rating of
sleep
(average)*
Monday 8:15 PM 8:40 PM 3:02 AM 6hrs 17min 3.4
Tuesday 8:15 PM 8:37 PM 2:54 AM 6hrs 17min 3.6
Wednesday 8:20 PM 8:39 PM 2:49 AM 6hrs 16min 3.5
Thursday 8:45 PM 9:00 PM 3:28 AM 6hrs 31min 3.7
Friday 9:45 PM 10:15 PM 6:40 AM 8hrs 39min 4.1
Saturday 9:02 PM 9:33 PM 6:17 AM 7hrs 48min 3.7
Sunday 8:08 PM 8:37 PM 2:55 AM 6hrs 29min 3.5
* 1 = very bad, 5 = great
Summary of Sleep diary results for each night of the week
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Findings
Summary of Sleep diary results forweek nights
0
10
20
30
4050
60
70
80
90
Numberofw
eekday
drivernights
Hours sleep (per night)
Generallyrecommended hourssleep per night
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Belenky et al. (2003), J Sleep Res, 12, 1-12
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Questionnaire results
Times of the week (Monday am, Monday pm, Tuesday am etc) drivers felt
they were at most risk of tiredness, fatigue or loss of attention
40
45
50
55
60
65
70
75
Mon
am
Mon
pm
Tues
am
Tues
pm
Wed
am
Wed
pm
Thurs
am
Thurs
pm
Fri am Fri pm
tirednessrisk
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Questionnaire results
Comments from those who ranked Mondays or Tuesdays as times of
high risk for tiredness, fatigue or loss of attention :
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Questionnaire results
What could be done to make tiredness or fatigue less of a problem
for log truck drivers?:
Solution mentioned Count
Less hours 12
Regular start times 7
higher wages 7
later start 4
Eat well / stay healthy (+ provision) 4Take breaks 4
More sleep 4
Improve scheduling 2
Awareness/encouragement 1
Log book pressure 1
Stimulants 1
Education public 1
Manage weekend 1
Places to pull over and socialise 1
longer breaks 1
Better roads 1
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Conclusions
Not enough sleep
Work during risky hours
Weekend/weekday transition problems?
Current working hours related to many driver issues
Work
(14 hours, inclcommuting)
Sleep
(8 hours)
Life: exercise, eating
recreation, chores,family, community
(2 hours!!!?)
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Thank you