uprr fatigue conference studies of passenger work rest schedules
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UPRR Fatigue Conference Studies of Passenger Work Rest Schedules. Patrick Sherry, Ph.D. University of Denver Transportation Institute. Overview. Typical passenger schedules FAST FAID What to do with outliers Next steps Tool box. Perspective. - PowerPoint PPT PresentationTRANSCRIPT
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UPRR Fatigue ConferenceUPRR Fatigue ConferenceStudies of Passenger Work Studies of Passenger Work
Rest SchedulesRest SchedulesPatrick Sherry, Ph.D.Patrick Sherry, Ph.D.
University of DenverUniversity of Denver
Transportation InstituteTransportation Institute
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OverviewOverview
• Typical passenger schedules– FAST – FAID
• What to do with outliers
• Next steps– Tool box
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PerspectivePerspective
the number of hours worked per week (over 40) and the number of hours worked per day (over 8) were positively associated with an increasing risk of injury (per 100 worker-years).
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Incidence rate IncreasedIncidence rate Increasedby hours worked per weekby hours worked per week
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Septa – 6am to 6pmSepta – 6am to 6pm7 hr sleep – no naps7 hr sleep – no naps
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Septa – 6am to 6pm Septa – 6am to 6pm 5 hr sleep – no naps5 hr sleep – no naps
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Septa – 5 hr sleep – 1 hr napSepta – 5 hr sleep – 1 hr nap
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MNR 5am – 7pm w IR 5hr slp – 6 daysMNR 5am – 7pm w IR 5hr slp – 6 days
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MNR 5am – 7pm w IR 6hr slp – 6 daysMNR 5am – 7pm w IR 6hr slp – 6 days
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MNR 5am – 7pm w IR 6hr slp – 8 daysMNR 5am – 7pm w IR 6hr slp – 8 days
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MNR 5am – 7pm w IR 6hr slp – No IRMNR 5am – 7pm w IR 6hr slp – No IR
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MNR 5am – 7pm w IR 6hr slp – IR NapMNR 5am – 7pm w IR 6hr slp – IR Nap
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MNR 5am – 7pm w IR 6hr slp – IR NapMNR 5am – 7pm w IR 6hr slp – IR Nap
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• Most schedules range from 5 am to 7pm
• Not all schedules have an IR
• Even if no nap taken during the IR period effectiveness ok
• Continuous 14 hr ok
• Effects of naps positive
• Evening starts more problematic
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Table 1 - Summary - Extra Boardworking under 70 more than 7% of
the timeSummary for LIRR
Analysis of Extralist & Relief July
Extralist Employees
Number of days worked 3945
Number of days BELOW 7% 3831
Number of days ABOVE 7% 114
Employees percent time working above 7% 2.9%
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LIRR ExtraboardAverage Daily Effectiveness Scores
by Days
Start Time - Start Hour
0 5 10 15 20 25
Ave
rage
FA
ST
Eff
ectiv
ene
ss S
core
s
60
70
80
90
100
110
Effectiveness vs Start Time (hr)Fit of Regression to Data
N = 3966 Days
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• Majority of work schedules are during the day
• Schedules starting later in the day extending into the early morning hours have more risk
• Consider various countermeasures to address risk
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• Hazard Identification
• Development of Countermeasures
• Tool Box
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MNR A155 1800-200amMNR A155 1800-200am
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MNR A100 2030-430MNR A100 2030-430
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MNR A135 2030-430amMNR A135 2030-430am
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MNR A135 with napsMNR A135 with naps
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A135 more napsA135 more naps
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MNR A135 with napsMNR A135 with naps
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A135 more napsA135 more naps
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Individual DifferencesIndividual Differences
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Two Different Ways of Looking at the DataTwo Different Ways of Looking at the Data
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Issues Issues
• Confidence Intervals• Individual differences• Varying assumptions• Effects of naps• Effects of caffeine• Scientific evidence not limited to models• Accuracy of models only 50 rms residual• Greater chance of accidents not same as actual
risk. • What is the risk?