Occupant Protection Special Traffic Enforcement Program Evaluation

Solomon, M. G. (Mark Geoffrey); Nissen, W. J.; Preusser, David F. · 1999 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This study evaluates the implementation and effectiveness of Occupant Protection Special Traffic Enforcement Programs (OP STEP), which are periods of highly visible seat belt law enforcement combined with extensive media support. Funded by the National Highway Traffic Safety Administration (NHTSA) under the Campaign Safe & Sober initiative, the program aimed to improve occupant protection and reduce impaired driving. The research was motivated by prior evidence from Canada and specific U.S. locations demonstrating that periodic, highly publicized enforcement waves could reverse declining seat belt use rates following the initial enactment of mandatory laws. The study sought to describe how 20 states implemented these NHTSA-funded grants and to evaluate the resulting changes in seat belt compliance. The methodology involved collecting summary and final reports submitted by the 20 participating states, which detailed enforcement activities, public information campaigns, and seat belt observation data. Additionally, in-depth case studies were conducted in Indiana, Iowa, and New Jersey to examine specific state approaches. These case studies utilized topical interviews with program administrators and local law enforcement personnel, as well as site visits. The evaluation analyzed data across multiple calendar quarters from late 1995 through mid-1998, focusing on the five-step demonstration model: pre-observational surveys, public information campaigns, media announcements, intensified enforcement periods, and post-observational surveys. The results indicate that OP STEP grants generated significant incremental enforcement efforts. Across the participating states, 273,437 seat belt citations and 963,895 other traffic citations were issued, alongside over 300,000 public information and education items distributed. Seat belt use rates increased with subsequent enforcement waves, though the magnitude of improvement varied significantly by state law type. Primary law states, where officers can stop vehicles solely for seat belt violations, achieved a mean increase of 16.8 percentage points in belt use. In contrast, secondary law states, where seat belt violations can only be cited if the driver is stopped for another offense, achieved a mean increase of only 5.6 percentage points. Analysis of states conducting five or more waves showed a cumulative increase of 20.6 percentage points for primary law states versus 7.6 percentage points for secondary law states. The study also noted that while enforcement changed police practices, particularly in secondary law states, the overall impact on compliance was substantially stronger where primary enforcement laws were in place. The study concludes that OP STEP programs successfully generated incremental enforcement and publicity efforts that improved seat belt use. However, the effectiveness was heavily dependent on the legal framework; primary law states achieved significantly higher compliance rates than secondary law states. The authors assert that stricter laws, when supported by serious enforcement and publicity, send a stronger message to motorists regarding state concern for injury risk, resulting in higher belt use. The findings suggest that while periodic enforcement waves are effective, their impact is maximized when coupled with primary enforcement legislation.

Key finding

Primary law states achieved an average seat belt use increase of 16.8 percentage points, whereas secondary law states achieved an average increase of only 5.6 percentage points.

Methodology

mixed_methods

Sample size: 20

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
• dui enforcement
• automated enforcement cameras

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: observational prevalence