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Outcomes of Variability in Teen Driving Experience and Exposure Evidence from Naturalistic Driving Studies (2025) / Chapter Skim
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2 Research Approach
Pages 6-13

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From page 6...
... The average learner's permit duration among participants was 10.35 months, and the teenagers drove a total of 18,686 trips and ∼110,000 miles during the learner's permit driving period; nine crashes occurred and were recorded. During the independent driving phase of data collection, the teenagers drove a total of ∼380,000 miles, and the dataset includes a total of 69 crashes for the learner's permit and independent driving 6
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From page 7...
... The following analyses include all 82 participants' learner's permit driving and independent driving data. Institutional Review Board and Data Use License Process The research team successfully applied for Institutional Review Board (IRB)
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From page 8...
... These independent variables allowed the research team to assess overall driving exposure, driving diversity, and driving behaviors that may impact safety outcomes. Key independent variables analyzed to address the research objec tives are discussed in the following and summarized in Table A-1 in the appendix.
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From page 9...
... . Driving Exposure Given that this research project attempted to determine how driving exposure at the beginning of the process of learning to drive may impact later independent driving, the research team wanted to develop an independent variable that allowed assessment of teen driving performance based upon how much driving occurred during the earliest driving periods possible.
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From page 10...
... Figure 3.   Two exposure groups in the SPDS defined by the median value of driving time during the learner's permit phase.
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From page 11...
... . Functional Road Classification This variable was obtained using mapping software data for both the SHRP 2 and SPDS datasets.
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From page 12...
... Thus, it is necessary to include vehicle access as a factor of driving exposure. The research team replicated Gershon's operational definition of vehicle access for teens: if they were the driver of the vehicle for 50% or more of all trips in that vehicle, they were the primary driver; if they operated the vehicle for less than 50% of all trips, they were defined as sharing a family vehicle.
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From page 13...
... rate was defined by the number of critical events divided by driving time in different driving phases and exposure groups. KRD This metric has been used in literature (Simons-Morton et al.
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Key Terms

  • median value
  • driving time
  • normalized driving
  • driving phase
  • driving exposure

  • driving hours
  • independent variables
  • teenage drivers
  • driving data
  • teen driving

  • spds nds
  • teen drivers
  • permit phase
  • permit driving
  • practice driving

  • driving phases
  • driving experience
  • independent variable
  • data coders
  • spds ndss

  • rapid evasive
  • evasive maneuver
  • driving familiarity
  • driving diversity
  • overall driving

  • total driving
  • driving performance
  • permit period
  • data reduction
  • nds collected


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