United States Department of Transportation
i
Results of Event Data Recorders Pre-Crash Duration Study: A Report to Congress
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2022-03-01
[PDF-316.37 KB]
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Edition:Final Report
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Abstract:The 2015 Fixing America’s Surface Transportation Act (FAST Act), Pub. L. No. 119-14, SEC. 24303, Vehicle Event Data Recorder Study, requires NHTSA to submit to Congress a report on results of a study determining the amount of time event data recorders in passenger motor vehicles should capture and record vehicle-related data to provide sufficient information to investigate the cause of motor vehicle crashes. The latest generation of EDRs provide snapshots of the vehicle kinematics and driver inputs in the seconds prior to a crash. However, current EDRs are only required to record a minimum of 5 seconds of pre-crash data at a frequency of 2 Hertz (a total of 10 data points). It was hypothesized that in many cases this duration may be insufficient to determine what led to the crash or the pre-crash actions taken by the driver. The study summarized here attempted to answer the question of whether extending the pre-crash recording duration would enable EDRs to more fully capture the history of driver pre-crash behavior. The research was conducted in two phases. The first phase estimated if the frequency of the current 5-second EDR duration was insufficient to capture pre-crash initiation of driver maneuvers in rear-end, intersection, and road departure crashes. The second phase examined the complete duration of the same driver actions based on normal and pre-crash driver actions extracted from two previous naturalistic driving studies.
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