Analysis of Ejection in Fatal Crashes

NHTSA · 1997 · ROSA P / United States. Department of Transportation. National Highway Traffic Safety Administration

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Summary

This 1997 research note from the National Highway Traffic Safety Administration (NHTSA) addresses the persistent problem of occupant ejection in fatal motor vehicle crashes. Despite a significant increase in safety belt usage among fatally injured occupants—from 2.7% in 1982 to 35.8% in 1996—the overall ejection rate remained above 20% throughout the period. Because ejected occupants face a fatality risk more than three times greater than those retained in the vehicle, the study investigates why ejection rates did not decline proportionally with increased belt use. The analysis reveals that the stability of the overall ejection rate is driven by trends within the unbelted population, as safety belts largely eliminate the possibility of ejection. The study utilizes data from NHTSA’s Fatality Analysis Reporting System (FARS) covering the years 1982 to 1996. The methodology involves comparing ejection rates between belted and unbelted occupants and analyzing time trends in crash characteristics. The data shows that while the ejection rate for belted occupants was low at 2.5%, it was 29.4% for unbelted occupants. Crucially, the ejection rate among unbelted individuals increased from 25% in the early 1980s to approximately 33% by 1996. The research identifies several key factors associated with this increase, including crash severity, vehicle type, and driver demographics. Key findings indicate that the rise in ejections among unbelted individuals is linked to more severe crash conditions. Rollover crashes were the primary factor, increasing the odds of ejection by over five times; the average ejection fraction in rollovers was 51%, compared to 11% in non-rollover fatal crashes. The rollover rate among unbelted individuals rose from 28% to over 37% during the study period. Additionally, the average pre-crash speed for unbelted occupants increased from 50 mph to nearly 55 mph, whereas speeds for belted occupants remained stable around 46–47 mph. Vehicle type also played a significant role; light trucks (including vans and SUVs) presented 1.4 times greater odds of ejection compared to passenger cars, a difference attributed to intrinsic crash dynamics rather than just rollover frequency. The proportion of light trucks in fatal crashes increased from 21% to 31%. Finally, younger drivers were identified as a predictor of ejection, with the average age of unbelted individuals in fatal crashes being 35, compared to 45 for belted individuals. The study concludes that the prevalence of ejection among unbelted occupants has increased due to a combination of higher crash severity (indicated by increased rollover rates and speeds), the growing presence of light trucks in fatal crashes, and the younger age of drivers involved. These findings suggest that the unbelted population is disproportionately involved in the types of severe crashes that result in ejection when safety belts are not used, highlighting the continued critical importance of seat belt usage for mitigating ejection risks.

Key finding

Rollover increased the odds of ejection more than fivefold, with 51 percent of occupants ejected in rollover fatal crashes versus 11 percent in non-rollover fatal crashes over 1982-1996.

Methodology

dataset

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• demographic disparities
• fatality injury trends
• incidence prevalence
• evacuation egress

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).

• Empirical Findings: crash risk outcomes, observational prevalence