United States Department of Transportation
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Event Data Recorder Duration Study [Appendix to a Report to Congress. Report No. DOT HS 813 082B]
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2022-03-01
[PDF-2.33 MB]
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Edition:Final Report
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Abstract:Widespread deployment of event data recorders offers opportunity to determine crash causation and better understand driver pre-crash behavior. New EDRs yield comprehensive snapshots of the vehicle kinematics and driver inputs prior to a crash including vehicle speed, yaw rate, acceleration, accelerator position, brake application, and steering inputs. However, one limitation is that most EDRs only record up to 5 seconds of pre-crash data, insufficient to determine crash or pre-crash actions in some cases. Extending recording duration would let EDRs more fully capture time history and driver car-following behavior prior to rear-end crashes. The goal of this project is to determine the EDR recording duration needed to investigate crash causation. In the first phase, the project examined three crash modes, rear crashes, intersection crashes, and road departures, and the time needed to capture driver errors. The second phase used data from the 100-Car Naturalistic Driving Study and the Second Strategic Highway Research Program NDS to understand the complete duration of driver actions in car following, intersection traversal, and lane departure. The EDR analysis cannot provide insight into what duration beyond 5 seconds of pre-crash data is needed to capture crash causation.
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Content Notes:This report is an appendix to a Report to Congress, Results of Event Data Recorders Pre-Crash Duration Study: A Report to Congress, Report No. DOT HS 813 082A.
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