Results of Event Data Recorders Pre-Crash Duration Study: A Report to Congress
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Summary
This report, mandated by the 2015 Fixing America’s Surface Transportation Act (FAST Act), evaluates whether the current National Highway Traffic Safety Administration (NHTSA) requirement for Event Data Recorders (EDRs) to capture a minimum of 5 seconds of pre-crash data is sufficient for investigating crash causation. Current regulations under 49 CFR Part 563 require EDRs to record vehicle kinematics and driver inputs, such as brake application and accelerator position, at a frequency of 2 Hertz. The study hypothesized that this 5-second window often fails to capture the initiation of critical driver maneuvers, thereby limiting the ability to determine the factors leading to a collision. The research, conducted by Virginia Polytechnic Institute and State University, utilized a two-phase approach. Phase 1 analyzed EDR data from the National Automotive Sampling System Crashworthiness Data System (NASS/CDS) covering 1,616 EDRs from rear-end, intersection, and road departure crashes between 2000 and 2015. This phase assessed the frequency with which the 5-second recording duration missed the onset of braking, steering, or accelerator release. Phase 2 examined complete driver action durations using data from two naturalistic driving studies: the 100-Car Naturalistic Driving Study and the Strategic Highway Research Program 2 (SHRP-2) Naturalistic Driving Study. These datasets provided detailed records of normal driving behaviors and near-misses to establish the time required to capture specific maneuvers. Phase 1 results indicated that the 5-second duration was insufficient to capture the initiation of braking in approximately 35% of cases across all three crash modes. For steering maneuvers, the insufficiency was even higher, reaching 80% in rear-end crashes and 88% in road departure crashes, though steering data availability was limited. Phase 2 findings established the recording durations needed to capture the 90th percentile of driver actions. For rear-end crashes, a duration of 12 seconds was required to capture brake initiation. For intersection crashes, 18.6 seconds were needed to capture the approach and traversal phases. For road departure crashes, 6 seconds were sufficient to capture lane drift and recovery, though accelerator release in some cases occurred up to 23 seconds prior to departure. The study concludes that the current 5-second minimum is inadequate for capturing the full history of driver pre-crash behavior. To encompass the 90th percentile of recording duration required for the analyzed crash modes and avoidance maneuvers, the authors recommend extending the pre-crash recording duration to 20 seconds. This extension would provide investigators with sufficient data to determine crash causation more accurately. The report notes limitations, including the reliance on older EDR data with lower sampling frequencies and the exclusion of variables such as weather conditions, road surface states, and the impact of emerging autonomous vehicle technologies.
Key finding
The current five-second EDR recording requirement is insufficient to capture the initiation of crash avoidance maneuvers in many crashes, and a 20-second duration is recommended to capture 90 percent of driver actions.
Methodology
mixed_methods
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- naturalistic crash near crash
- crash reconstruction hf
- incidence prevalence
- perception reaction time
- braking response
- pre crash contributing factors
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Empirical Findings: crash risk outcomes, observational prevalence
- Methodological Resource: dataset resource