Relative Risk of Fatal Crash Involvement by BAC, Age, and Gender
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Summary
This study, conducted by the National Highway Traffic Safety Administration (NHTSA), aims to refine estimates of the relative risk of fatal crash involvement associated with alcohol consumption. The research was motivated by the need to update prior findings using recent data and to specifically estimate risks for the policy-relevant Blood Alcohol Concentration (BAC) range between 0.08% and 0.10%, a threshold adopted by many states as the legal limit for driving. The study seeks to determine how age, gender, and BAC levels influence the likelihood of being involved in or fatally injured in a crash. The researchers employed logistic regression to analyze data from two primary sources: the Fatality Analysis Reporting System (FARS) for fatal crashes occurring in 1995 and 1996, and the 1996 National Roadside Survey (NRS) for driver exposure data. The analysis focused on drivers of four-wheel passenger vehicles during weekend nights. To address missing BAC data in FARS, the study utilized multiple imputation techniques. The researchers defined six driver groups based on crash type (single-vehicle, two-vehicle, or all crashes) and outcome (fatal injury or involvement). They compared the distribution of crash-involved drivers against the roadside exposure distribution to calculate odds ratios, which served as estimates of relative risk. Statistical methods accounted for the complex survey design and the uncertainty introduced by imputed BAC values. The results demonstrate that the relative risk of fatal crash involvement increases steadily with rising BAC across all age and gender groups. A notable finding is that even a small increase in BAC significantly elevates risk; for male drivers aged 16–20, a 0.02 percentage point increase in BAC more than doubles the relative risk of fatal injury in single-vehicle crashes. At a BAC of 0.09% (the midpoint of the 0.08–0.10 range), the relative risk of fatal single-vehicle crash injury ranged from 11.4 for drivers aged 35 and older to 51.9 for males aged 16–20. Older drivers consistently exhibited lower risks than younger drivers, and females faced lower risks than comparable males. The study also confirmed that risk curves are steeper for single-vehicle crashes than for multi-vehicle crashes, reflecting the higher likelihood of driver responsibility in single-vehicle incidents. The significance of this study lies in its confirmation that drivers with BACs below 0.10% pose a substantially elevated risk to themselves and other road users. By providing systematic estimates for the 0.08–0.10% BAC range, the findings support the legal justification for per se limits at 0.08%. The research underscores that impairment and crash risk begin at very low BAC levels, particularly among young male drivers, highlighting the importance of enforcement and policy measures targeting even moderate alcohol consumption while driving.
Key finding
A 0.02 percentage point increase in BAC among 16-20 year old male drivers more than doubles the relative risk of fatal single vehicle crash injury, while at a BAC of 0.09%, relative risk varies from 11.4 for drivers aged 35 and older to 51.9 for male drivers aged 16-20.
Methodology
dataset
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 (7 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 3 | 2026-05-28 |
| 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
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- sex gender
- induced exposure
- alcohol
- demographic disparities
- comparative international
- incidence prevalence
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