Design of an Evaluation Plan for Senate Bill 1046

Chierichetti, Maria; Moghadam, Armin; Davoudi, Fatemeh · 2022 · ROSA P / San Jose State University. College of Business. Mineta Transportation Institute

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Summary

This report outlines the design of an evaluation plan for California Senate Bill 1046 (SB 1046), which mandates the installation of ignition interlock devices (IIDs) for repeat and injury-involved Driving Under the Influence (DUI) offenders. The research was motivated by the persistent public safety issue of alcohol-impaired driving, which accounted for 26% of traffic fatalities in California in 2019. While previous legislation and pilot programs demonstrated that IIDs reduce recidivism while installed, concerns regarding long-term effectiveness and sociodemographic disparities necessitated a rigorous evaluation framework for the statewide mandate effective from 2019 to 2026. The authors developed the evaluation plan through a systematic meta-analysis of 96 relevant studies published between 2010 and 2022. This literature review identified key data sources, including driver records, survey data, and crash statistics, as well as common analytical methods. Based on these findings, the report proposes an evaluation structure centered on three primary research questions: the impact of SB 1046 on the frequency and severity of DUI-related crashes; the effect on DUI recidivism rates; and the influence on IID installation rates. The design specifies a comparative analysis using data collected between January 1, 2019, and January 1, 2024, against a control period from 2014 to 2019. To ensure validity, data from four counties involved in a prior pilot program are excluded from the control group. The proposed methodology recommends collecting specific metrics, including injuries and deaths from alcohol-related accidents, IID installation rates relative to required offenders, recidivism statistics, and device lockout data. The authors suggest employing descriptive statistics, time series analysis, analysis of variance, and logistic regression to assess these variables. The plan also incorporates the analysis of sociodemographic factors, such as age and gender, and geographic designations to determine if these variables influence program effectiveness or offense recurrence. The significance of this work lies in establishing a standardized, evidence-based framework for assessing the efficacy of SB 1046, with the actual evaluation scheduled for 2024. The report highlights critical limitations that must be considered during analysis, including limited follow-up time for offenders, adjudication lags, potential reporting errors, and the confounding effects of the COVID-19 pandemic on driving behavior. Additionally, it identifies financial burdens and monitoring challenges as barriers to successful implementation. By defining clear research questions and statistical approaches, this plan aims to provide policymakers with robust data on whether the mandatory IID program effectively reduces impaired driving and enhances road safety in California.

Key finding

The evaluation plan for Senate Bill 1046 is structured around three core research questions regarding DUI crash metrics, recidivism, and installation rates, utilizing a comparative analysis of pre- and post-implementation data.

Methodology

review

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• dui enforcement
• alcohol detection systems
• regulatory evaluation
• driver education effectiveness

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).

• Applied Guidance: countermeasure evaluation, policy recommendations
• Empirical Findings: crash risk outcomes