Strategies to Increase Seat Belt Use: An Analysis of Levels of Fines and the Type of Law

Nichols, James L.; Tippetts, A. Scott; Fell, James C.; Auld-Owens, Amy; Wiliszowski, Connie H.; Haseltine, Philip W.; Eichelberger, Angela · 2010 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This study, conducted by researchers from Bedford Research and the Pacific Institute for Research and Evaluation for the National Highway Traffic Safety Administration (NHTSA), investigates the relationship between seat belt compliance and two specific legal strategies: the type of enforcement law (primary versus secondary) and the monetary level of fines. While previous research established that primary enforcement laws and high-visibility enforcement campaigns significantly increase seat belt use, the impact of fine amounts remained less understood despite public support for higher penalties. The study aimed to quantify these relationships using longitudinal data to determine if increasing fines serves as an effective strategy for further improving compliance. The researchers utilized longitudinal panel regression analyses on data spanning two distinct time periods: 1997–2002 (associated with Operation ABC mobilizations) and 2003–2008 (associated with Click It or Ticket mobilizations). The analysis included over 600 state-years of data. Two primary outcome measures were employed: observed statewide seat belt use rates from annual surveys and seat belt use rates among front-seat occupants killed in passenger vehicle crashes, derived from the Fatality Analysis Reporting System (FARS). Predictor variables included law type, fine amounts (1995–2008), enforcement activity, and media expenditures. The study controlled for enforcement and media variables, though enforcement data were limited to specific mobilization periods. The results demonstrated that upgrading from secondary to primary enforcement laws was associated with substantial increases in compliance, specifically 9- to 10-percentage-point increases in FARS use and 10- to 12-percentage-point increases in observed use. Fine levels also showed a significant, additive effect. Increasing a state’s fine from the median of $25 to $60 was associated with a nearly 4-percentage-point increase in both FARS and observed use. Increasing the fine from $25 to $100 resulted in a nearly 7-percentage-point increase. The study found diminishing returns for fines exceeding $100. Additionally, odds ratio analyses indicated that primary laws and higher fines significantly increased the odds of being buckled, with effects varying by time period and measurement type. Media expenditures alone did not show a significant association with increased use, suggesting publicity is effective primarily when coupled with enforcement. The study concludes that increasing fine levels is a viable strategy for raising seat belt use, complementing primary law upgrades and high-visibility enforcement. The effects of law type and fine amounts are additive, meaning states can maximize compliance by implementing both primary enforcement and higher fines. However, the authors note that publicizing fine increases is essential for maximizing their impact, as public awareness drives compliance. The findings provide empirical evidence to support policy adjustments regarding penalty structures, suggesting that modest increases in fines, particularly up to $100, yield measurable improvements in occupant protection without the need for more controversial measures like penalty points, which lack broad public support.

Key finding

Upgrading from secondary to primary seat belt laws was associated with 9- to 12-percentage-point increases in use, while increasing fines from $25 to $60 was associated with a nearly 4-percentage-point increase in use.

Methodology

modeling

Provenance

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

Topics

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• seat belt use
• child passenger safety

Information type

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• Empirical Findings: observational prevalence