Safety belt and motorcycle helmet use in Virginia : results of the 1994 survey : technical assistance report.
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Summary
This technical assistance report details the methodology and findings of a 1994 observational survey measuring safety belt and motorcycle helmet use in Virginia. The study was conducted by the Virginia Transportation Research Council to maintain longitudinal data consistency following the expiration of the Intermodal Surface Transportation Efficiency Act (ISTEA) § 153 incentive program. Although Virginia had already qualified for approximately $1.5 million in federal funds by meeting compliance standards in 1992 and 1993, the Virginia Department of Motor Vehicles requested continued data collection using identical protocols to enable valid year-over-year comparisons. The survey adhered strictly to National Highway Traffic Safety Administration (NHTSA) guidelines, requiring a probability-based design with a relative error of no more than ±5% and 95% confidence. The sampling frame excluded the 74 jurisdictions comprising the smallest 15% of Virginia’s population. To address concerns about overrepresenting rural areas, the sample was stratified by population density: 84 sites were randomly selected from urban areas (representing 68% of the eligible population) and 36 from rural areas. A total of 120 sites were used, consistent with previous years. Data collectors observed traffic for one hour at each site during randomly assigned daylight hours across all days of the week. Observations focused on drivers and outboard front-seat passengers in the curb lane for passenger cars, and all motorcycle drivers and passengers. Multilane highway observations for cars were weighted by the number of travel lanes to estimate statewide usage. The 1994 survey yielded 29,584 weighted observations of passenger car occupants and 247 motorcycle observations. The statewide safety belt use rate was calculated at 71.8%, with a relative error of 0.15%. Motorcycle helmet use remained at 100.0%. These results were compared against longitudinal data from 1992 and 1993, which showed safety belt use rates of 71.6% and 73.2%, respectively, and consistent 100% helmet compliance. The report concludes that there is no practical difference in safety belt usage rates across the three-year period, indicating stable compliance levels in Virginia despite the end of the federal incentive program.
Key finding
Virginia's 1994 safety belt use rate was 71.8% and motorcycle helmet use rate was 100.0%.
Methodology
field_study
Sample size: 120
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
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| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
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| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: observational prevalence, crash risk outcomes