Assessing the Effectiveness of Montana’s Vehicle Occupant Protection Program [summary]

Stanley, Laura; Manlove, Kezia; Peck, Alyssa · 2015 · ROSA P / Montana. Dept. of Transportation. Research Programs

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Summary

This study addresses the stagnation of seat belt compliance rates in Montana, which remained between 76% and 81% since 2002 despite extensive state investment in occupant protection programs. Motivated by National Highway Traffic Safety Administration recommendations and rising fatal crash incidences, the research aimed to quantitatively evaluate the effectiveness of four specific Montana Department of Transportation (MDT) initiatives: Office of Public Instruction driver education, Selective Traffic Enforcement Programs (STEP), Buckle Up Montana (BUMT) coalitions, and media campaigns. The primary objective was to determine the relationship between these program activities and seat restraint use, addressing a gap in transportation safety literature regarding the assessment of multiple overlapping programs within single communities. The researchers employed a cross-disciplinary approach, utilizing Geographic Information Systems (GIS) to link National Occupant Protection Use Survey (NOPUS) data with the spatial and temporal presence of the four programs. By constructing separate GIS layers for each program—such as BUMT coalition regions and county-level STEP expenditures—the team extracted local program measures for each survey site. Statistical models were then used to compare seat belt use at sites impacted by specific programs against unimpacted sites, allowing for the isolation of program-specific effects and the identification of potential synergies or redundancies. The analysis revealed that MDT programs contribute to small but significant increases in seat belt use, though their impact is overshadowed by factors like road type, population density, and income. BUMT coalition presence showed the strongest positive association with seat restraint use, particularly in areas without large media catchments. STEP demonstrated high effectiveness when analyzed in isolation, but its impact appeared to erode in models including other programs, likely due to data limitations rather than reduced efficacy. Media campaigns exhibited diminishing returns, with significant benefits only up to $12,000 in investment; furthermore, media and BUMT programs showed an antagonistic relationship, suggesting redundant targeting. Driver education completion rates showed no detectable association with increased seat belt use. The findings suggest that program effects are largely additive, except for the overlap between media and BUMT. The researchers recommend continuing STEP and BUMT efforts while diversifying media investment levels to better understand per-dollar benefits. They also advise separating media and BUMT initiatives to eliminate redundancy and conducting designed experiments to isolate STEP’s specific impact. Future evaluations should supplement NOPUS data with pre- and post-intervention collection and adopt electronic data records for efficiency. Additionally, a human factors assessment is recommended to understand driver attitudes and traffic safety culture, providing a comprehensive basis for optimizing occupant protection strategies.

Key finding

Buckle Up Montana coalition presence was associated with increased seat belt use, while media investment showed diminishing returns after $12,000, and STEP effectiveness was masked when other programs were included in the model.

Methodology

dataset

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
• regulatory evaluation
• 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, crash risk outcomes