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), aimed to refine estimates of the relative risk of fatal crash involvement for drivers based on blood alcohol concentration (BAC), age, and gender. The research was motivated by the need to update previous findings using recent data and to specifically estimate risks within the policy-relevant BAC range of 0.08% to 0.10%, a range where legal limits varied across U.S. states. The study sought to determine how alcohol impairment affects crash risk across different demographic groups and crash types. The researchers employed logistic regression to analyze data from two primary sources: the Fatality Analysis Reporting System (FARS) for fatal crash data from 1995–1996 and the 1996 National Roadside Survey (NRS) for driver exposure data. The analysis focused on drivers of four-wheel passenger vehicles involved in crashes 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 frequency 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 indicated that the relative risk of fatal crash involvement increased steadily with rising BAC levels across all age and gender groups. For single-vehicle crashes, a 0.02 percentage point increase in BAC more than doubled the risk of fatal injury for male drivers aged 16–20. At the midpoint of the 0.08%–0.10% BAC 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. Generally, older drivers and females exhibited lower risks of fatal injury in single-vehicle crashes compared to younger males. However, model fit was poorer for multi-vehicle crashes, likely due to the presence of innocent victims and complex crash dynamics, though the estimates were still considered conservative approximations. The study concludes that drivers with non-zero BACs, even those below 0.10%, pose a substantially elevated risk to themselves and other road users. This is the first study to systematically estimate relative risk for the 0.08%–0.10% BAC range, providing critical evidence for traffic safety policy. The findings reinforce the understanding that alcohol impairment significantly increases crash risk at low levels and highlight the heightened vulnerability of young male drivers. These results support the argument for stricter BAC limits and underscore the persistent danger of drinking and driving despite overall declines in alcohol-related fatalities.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-25 |
| archive | success | unpaywall | — | — | 2 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-25 |
| chunk | success | chunk | — | — | 1 | 2026-06-25 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-25 |
| promote | success | — | — | — | 1 | 2026-06-25 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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- Empirical Findings: crash risk outcomes