Safety belt and motorcycle helmet use in Virginia : results of the 1993 survey to qualify for incentive funds under ISTEA, Section 153.
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Summary
This report documents the methodology and findings of a 1993 observational survey conducted in Virginia to determine compliance with safety belt and motorcycle helmet laws. The study was motivated by Section 153 of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA), which established a federal incentive grant program for states adopting mandatory safety equipment laws. While Virginia had already qualified for first- and second-year funding by enacting the necessary laws, third-year funding required demonstrating specific compliance thresholds: at least 70% safety belt use and 85% motorcycle helmet use. The survey aimed to provide the statistical evidence needed to secure this third-year funding. The research team from the Virginia Transportation Research Council conducted the survey in June and July 1993, adhering strictly to guidelines set by the National Highway Traffic Safety Administration (NHTSA). The methodology employed a probability-based sampling design to ensure statewide representativeness. The sampling frame included all Virginia counties and independent cities except the 74 jurisdictions comprising the smallest 15% of the state’s population. To address concerns about overrepresenting rural areas, the sample was stratified by population density, selecting 82 sites from urban areas and 38 from rural areas, totaling 120 observation sites. Data collection involved direct observation of traffic at these sites for one hour each, covering all days of the week and daylight hours. Observers recorded shoulder belt use for drivers and outboard front-seat passengers in passenger cars, as well as helmet use for all motorcycle occupants. Observations on multilane highways were weighted by the number of travel lanes to approximate total traffic volume. The results indicated that Virginia met the federal requirements for third-year funding. The weighted safety belt use rate for passenger car occupants was 73.2%, with a standard error of 0.0008 and a relative error of 0.11%. This figure was derived from 24,299 weighted observations of car occupants. Motorcycle helmet use was observed at a rate of 100%, based on 236 observed motorcycle riders and passengers, resulting in zero variance and zero relative error. Because both usage rates exceeded the NHTSA-mandated thresholds of 70% for belts and 85% for helmets, the data confirmed Virginia’s eligibility for the third-year ISTEA incentive funds. The report concludes that the state successfully demonstrated the required level of compliance through rigorous observational data collection.
Key finding
Virginia achieved a 73.2 percent safety belt use rate and a 100 percent motorcycle helmet use rate in the 1993 observational survey.
Methodology
field_study
Sample size: 120
Provenance
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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: observational prevalence, crash risk outcomes