IRTAD Special Report : the availability of seat belt wearing data in OECD member countries, 1995

NHTSA · 1997 · ROSA P / Great Britain. Dept. for Transport

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Summary

This 1997 special report from the International Road Traffic and Accident Database (IRTAD) assesses the availability and comparability of seat belt wearing data across OECD member countries. The study was motivated by the need to enhance international comparisons of road accident fatalities by incorporating exposure data on occupant protection. Since seat belts reduce fatal and serious injuries by approximately 50%, variations in wearing rates significantly impact casualty statistics. The report aims to determine whether national data on seat belt usage is sufficiently robust and standardized to be included in the IRTAD system as a meaningful exposure measure. The methodology involved a two-phase survey conducted between 1994 and 1996. Initially, 26 IRTAD participating countries were surveyed regarding the availability of data for five vehicle types, various age groups, three road types (motorways, rural, urban), and seating positions. Responses were received from 20 countries. A supplementary survey then focused specifically on the statistical quality of data for car drivers, examining sample sizes, national representation, and periodicity to assess comparability. The report also reviewed national legislation, exemptions, and penalty systems to contextualize the data. The findings reveal significant disparities in data availability and methodology. Only Greece and Portugal reported no available data. While most countries monitored drivers and front-seat passengers, data for rear-seat passengers and children was often missing or inconsistent; notably, Canada, France, and Japan lacked monitoring systems for child restraints, while France, Japan, and the United States lacked systems for rear-seat passengers. Wearing rates varied widely, with urban driver rates ranging from over 85% in countries like Canada and Sweden to 60% or less in the Czech Republic and Hungary. The supplementary survey highlighted substantial differences in sampling procedures, including sample size, regional coverage, and survey frequency, which limit precise quantitative comparisons. For instance, some countries used extensive regional sampling, while others relied on limited sites. The report concludes that while methodological differences hinder exact statistical comparisons, the available data provides a useful qualification for interpreting international fatality trends. It recommends including seat belt data for car drivers on motorways, rural, and urban roads in IRTAD, despite the limitations. The authors emphasize the need for international cooperation to harmonize methodologies, particularly regarding regional variation and sampling standards, to improve data quality and the reliability of cross-national road safety assessments.

Key finding

Significant differences in sampling procedures, sample sizes, and data periodicity among OECD countries limit the statistical robustness and international comparability of seat belt wearing rate estimates.

Methodology

survey

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
• child passenger safety
• comparative international

Information type

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• Empirical Findings: observational prevalence