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10 The CPRS was the first follow-on study to the SHRP 2 NDS. It was undertaken to make it easier for researchers to identify epochs wherein a participantâs use of a cell phone to talk or to send a text message coincided or overlapped with a recorded driving epoch showing that participant concurrently driving a study vehicle. With such real-world observation of people driving while using cell phones, researchers can better under- stand any associated behaviors (e.g., possibly identifying the scenarios in which drivers choose to engage or to become hypervigilant) and their possible impacts on crash risk. Obtaining the cell phone records for this study involved reaching out to SHRP 2 NDS participants and interacting with them remotely to ensure they were willing to participate, were willing to fully consent, and were able to provide either their own copies of their cell phone records or to take the necessary steps to allow researchers to obtain their records directly from their wireless carriers. Steps were taken through- out the process to comply with IRB requirements, with FCC regulations, and with the policies and procedures set by the two individual wireless carriers that agreed to provide autho- rized electronic records. The cell phone records collected in this effort represent a wide demographic of drivers and more than 6.3 million call and texting events, including 483,000 events that overlap with driving data and can be examined by researchers in the future. C h a p t e r 5 Study Summary and Future Research Implications
