Evaluation of Utah’s .05 BAC Per Se Law
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Summary
This report evaluates the impact of Utah’s 2017 legislation lowering the legal blood alcohol concentration (BAC) limit for driving from 0.08 g/dL to 0.05 g/dL, which took effect in December 2018. Utah became the first U.S. state to adopt a per se BAC limit below 0.08, motivated by the goal of improving traffic safety despite opposition citing potential economic harm and increased arrests. The study aimed to comprehensively assess changes in crashes, fatalities, DUI arrests, driver behavior, and economic indicators such as alcohol sales and tourism. The researchers analyzed state crash data from 2010 to 2019, Fatality Analysis Reporting System (FARS) data, DUI arrest records, legislative testimony, and surveys on public awareness and behavior. Economic impacts were assessed using data on alcohol sales, tax revenues, and tourism metrics. Time-series analyses compared crash rates before and after the law’s passage and implementation, while FARS data were compared against national trends and neighboring states. Results indicated significant safety improvements. State crash data showed reductions in almost all crash and alcohol-involvement measures, with estimated decreases ranging from 10% to 25% in the months following the law’s passage and implementation. Specifically, single-vehicle nighttime crashes involving alcohol saw reductions exceeding 20%. FARS data revealed that Utah’s fatal crash rate dropped by 19.8% and fatality rate by 18.3% from 2016 to 2019, outperforming the national average reductions of 5.6% and 5.9%, respectively. Contrary to fears, alcohol-related DUI arrests did not increase markedly; the rise in total DUI arrests was primarily driven by drug-related offenses. Surveys indicated that while drinkers held less favorable views of the law, 22.1% reported changing behavior, most commonly by securing alternative transportation. Furthermore, alcohol sales, per capita consumption, tourism, and tax revenues continued to increase, refuting concerns about negative economic impacts. The study concludes that lowering the BAC per se limit to 0.05 had demonstrably positive effects on highway safety in Utah without causing the predicted economic or enforcement burdens. The findings support the efficacy of lower BAC limits as a strategy to reduce alcohol-impaired driving crashes and fatalities, providing empirical evidence for other states considering similar legislative changes.
Key finding
Utah's implementation of a .05 BAC per se law resulted in significant reductions in crash rates and fatalities while avoiding projected negative economic and enforcement consequences.
Methodology
field_study
Provenance
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| 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 | — | — | 20 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: crash risk outcomes