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Long-Term Effects of a Multi-Component Community-Level Intervention to Reduce Single-Vehicle Nighttime Crashes:
Robert Saltz1, Mallie J Paschall1
1Prevention Research Center, Pacific Institute for Research & Evaluation, Berkeley, California.
Journal of Studies on Alcohol and Drugs
|August 6, 2024
Summary
A high-visibility alcohol enforcement intervention significantly reduced alcohol-related crashes in young drivers long-term. This study confirms lasting positive effects on road safety for adolescents and young adults.
Area of Science:
- Public Health
- Traffic Safety Research
- Substance Abuse Prevention
Background:
- Previous research indicated a reduction in single-vehicle night-time (SVN) crashes among young drivers following a multi-component alcohol enforcement intervention.
- The long-term impact of such interventions on alcohol-related motor vehicle crashes remained to be fully understood.
Purpose of the Study:
- To evaluate the long-term effectiveness of a multi-component, high-visibility alcohol enforcement intervention on alcohol-related motor vehicle crashes.
- To determine if the observed reductions in crashes persisted beyond the intervention period.
Main Methods:
- A randomized trial involving 24 California cities, with 12 assigned to the intervention (April 2013-March 2016).
- Multi-level negative binomial regression analyses were used on motor vehicle crash data from 2010-2021.
- Analyses controlled for sociodemographic factors, time trends, COVID-19, and pre-intervention crash levels.
Main Results:
- A statistically significant decrease in monthly SVN crashes among 15- to 30-year-olds was observed in intervention cities through 2021 (IRR [95% CI] = 0.88 [0.79, 0.98], p < .05).
- The intervention demonstrated sustained effectiveness in reducing crashes in the post-intervention period.
Conclusions:
- Multi-component, high-visibility alcohol enforcement interventions can yield long-term reductions in alcohol-related crashes.
- These findings suggest a lasting positive impact on road safety for adolescent and young adult drivers, potentially reducing related injuries and fatalities.
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