Estimated safety belt use rates under primary and secondary enforcement statutes : final report.

Stoke, Charles B; Vander Lugt, Robert D · 1991 · ROSA P / Virginia Transportation Research Council (VTRC)

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Summary

This 1991 report by the Virginia Transportation Research Council addresses the potential impact of modifying Virginia’s mandatory use law (MUL) for safety belts. Specifically, it estimates changes in statewide safety belt use rates if the state shifted from secondary enforcement (where officers can only cite belt violations when stopping a driver for another offense) to primary enforcement (allowing stops solely for belt violations). The study was motivated by Virginia’s relatively low statewide use rate of 54% in 1990 and the desire to identify effective methods for increasing compliance. The researchers employed a multi-faceted methodology involving a literature review, an analysis of MUL statutes across all states, and an examination of three data sources: the National Highway Traffic Safety Administration’s (NHTSA) Federal 19-City Surveys, NHTSA’s Observed Safety Belt Use Statistics by State, and longitudinal observational surveys conducted in Virginia. The Virginia data covered a six-year period, including three years prior to and three years after the MUL’s effective date in January 1988. The study also analyzed statutory characteristics, such as fine amounts, point assessments, and requirements for public information and education (PI&E) campaigns. The findings indicate that safety belt use is generally higher in states with primary enforcement compared to those with secondary enforcement. Literature reviews confirmed that high use rates are associated with both active enforcement and robust PI&E campaigns, rather than either factor alone. Statutory analysis revealed that all primary enforcement states applied laws only to front-seat occupants, whereas several secondary enforcement states included rear-seat occupants. Data from NHTSA surveys showed that cities with primary enforcement had higher driver use rates than those with secondary enforcement. In Virginia, the MUL led to a significant increase in front-seat belt use, rising from 33.3% in 1987 to a peak of 63.4% in 1988. Conversely, rear-seat belt use declined from 27.3% in 1987 to 25.3% in 1990, creating a disparity of over 30 percentage points between front and rear occupants. The study concludes that Virginia could achieve a 6 to 8 percentage point increase in statewide safety belt use through either of two legislative changes. First, modifying the current MUL to permit primary enforcement would likely raise the statewide rate from 54% to approximately 62%, aligning Virginia with the rates observed in other primary enforcement states. Second, amending the MUL to apply to both front and rear seat occupants would yield a similar increase, assuming rear-seat occupants would adopt usage patterns similar to those of front-seat occupants. The report emphasizes that enforcement efficacy is enhanced by public awareness and that primary enforcement, particularly when implemented with phased warning periods, is superior to secondary enforcement in promoting compliance.

Key finding

Modifying Virginia's safety belt law to allow primary enforcement or extending it to rear seat occupants would increase the statewide safety belt use rate by 6 to 8 percentage points, raising it from 54% to approximately 62%.

Methodology

review

Provenance

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Topics

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• seat belt use
• child passenger safety

Information type

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• Applied Guidance: policy recommendations
• Empirical Findings: observational prevalence