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Abstract:
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Objectives: This study examined two issues: the overall prevalence and rate of cell phone use (call and text rate per day and while driving), and whether or not individual crash risk changes as overall cell phone use changes. Methods: This paper uses the Second Strategic Highway Research Program Naturalistic Driving Study (SHRP 2 NDS) data with over 3,500 participants, who provided up to 3 years of driving data. Of these participants, 620 provided cell phone records, 564 of which included call records and text records. These records produced rates of calls and texts per day for each of these participants, as well as rates of calls and texts per hour of driving when overlaid with the driving data. Additionally, algorithmic triggers identified the crashes for these cell phone participants. This allowed for the calculation of crash rates per hour of driving. Statistical models were then run to determine if crash rate changed as overall cell phone use changed. Results: Participants made an average of 26.77 texts per day (S.D. = 38.01, min = 0, max = 226.23) and 7.16 calls per day (S.D. = 6.29, min = 0, max = 71.39). Participants also made an average of 1.19 texts per hour of driving (
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