Evaluation of Maine’s Seat Belt Law Change from Secondary to Primary Enforcement

Chaudhary, Neil K.; Tison, Julie; Casanova, Tara · 2010 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This study evaluates the impact of Maine’s transition from secondary to primary seat belt enforcement, which took effect on September 20, 2007, with full enforcement beginning April 1, 2008. The research addresses a gap in previous literature regarding how primary law upgrades affect nighttime seat belt use, a period when usage rates are typically lower and crash risks are higher. The study aimed to determine if the law change increased observed belt use during both day and night, improved public awareness of enforcement capabilities, and altered police attitudes and enforcement behaviors. The evaluation employed a three-part methodology conducted across three data collection waves: Wave 1 (late February 2008, during a warning-only period), Wave 2 (late April/early May 2008, after full enforcement began), and Wave 3 (late May/early June 2008, following the national "Click It or Ticket" campaign). First, awareness surveys were administered to licensed drivers at eight Bureau of Motor Vehicle offices. Second, researchers conducted approximately 27,000 seat belt observations at 40 sites across 10 counties, utilizing night vision technology for nighttime data collection between 9 p.m. and 4 a.m. Third, focus groups were held with representatives from six law enforcement agencies to assess police perceptions of the law change and enforcement tactics. The results demonstrated significant improvements in both public knowledge and observed behavior. Awareness surveys revealed that motorists increasingly understood that police could issue citations for seat belt violations alone; the percentage of respondents believing tickets required another offense dropped significantly from 21% in Wave 1 to 10% in Wave 3. Perceived enforcement certainty also rose. Observed seat belt use increased consistently across all waves. Daytime usage rose from 77% in Wave 1 to 84% in Wave 3, while nighttime usage increased from 69% to 81%. Regression analysis indicated that the law change had a slightly greater influence on nighttime belt use than daytime use, although daytime rates remained higher overall. Police focus groups reported positive attitudes toward the new law and noted visible improvements in motorist compliance. The study concludes that upgrading to primary enforcement effectively increases seat belt use, particularly during high-risk nighttime hours. The findings suggest that primary laws enhance public awareness of enforcement certainty and encourage behavioral adjustments among drivers. These results provide evidence for other states considering similar legislative upgrades, indicating that primary enforcement can successfully target the demographic and temporal groups most at risk for severe crashes.

Key finding

Maine's primary seat belt law resulted in observed belt use increasing from 77% to 84% during the day and from 69% to 81% at night, with the relative increase being greater for nighttime usage.

Methodology

mixed_methods

Sample size: 989

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).

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

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
• Empirical Findings: observational prevalence