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An Analysis of Motor Vehicle Rollover Crashes and Injury Outcomes

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An Analysis of Motor Vehicle Rollover Crashes and Injury Outcomes DOT HS 810 741 March 2007 An Analysis of Motor Vehicle Rollover Crashes and Injury Outcomes Published by NHTSA’s National Center for Statistics and Analysis This document is available to the public from the National Technical Information Service, Springfield, Virginia 22161 This publication is distributed by the U.S. Department of Transportation, National Highway Traffic Safety Administration, in the interest of information exchange. The opinions, findings, and conclusions expressed in this publication are those of the author and not necessarily those of the Department of Transportation or the National Highway Traffic Safety Administration. The United States Government assumes no liability for its contents or use thereof. If trade or manufacturers’ names are mentioned, it is only because they are considered essential to the object of the publication and should not be construed as an endorsement. The United States Government does not endorse products or manufacturers. Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipients's Catalog No. DOT HS 810 741 4. Title and Subtitle 5. Report Date An Analysis of Motor Vehicle Rollover Crashes and March 2007 Injury Outcomes 6. Performing Organization Code NPO-121 7. Author(s) 8. Performing Organization Report No. Alexander Strashny 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS)n code Mathematical Analysis Division, Office of Traffic Records and Analysis National Center for Statistics and Analysis National Highway Traffic Safety Administration 11. Contract of Grant No. U.S. Department of Transportation NPO-121, 400 Seventh Street SW. Washington, DC 20590 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Mathematical Analysis Division, Office of Traffic Records and Analysis NHTSA Technical Report National Center for Statistics and Analysis National Highway Traffic Safety Administration 14. Sponsoring Agency Code U.S. Department of Transportation NPO-121, 400 Seventh Street SW. Washington, DC 20590 15.Supplementary Notes 16. Abstract Rollover crashes can have serious consequences. In 2004, 33% of passenger vehicle occupant fatalities were in vehicles that rolled over. This report analyzes data related to passenger vehicle rollovers, including rollover propensity and injury outcomes. The report uses the Fatality Analysis Reporting System and National Automotive Sampling System General Estimates System databases to tabulate data on passenger vehicles and their occupants by a variety of variables and performs logistic analysis of the data. Tabulations focus on years 1994, 2003, and 2004; logistic analysis pools data for years 2000 through 2004. We specifically analyze factors that (a) were associated with vehicle rollovers in single-vehicle crashes of passenger vehicles; and (b) were associated with ejection status and varying degrees of injury severity of occupants of passenger vehicles that rolled over in single-vehicle crashes. Among other things, we also analyze the relationship between various anthropomorphic characteristics, such as the Body Mass Index, and seat belt effectiveness for drivers of passenger vehicles that were in single-vehicle rollovers. This report may be useful to other researchers and may provide a starting point for further analysis of vehicle rollovers and injury outcomes. 17. Key Words 18. Distribution Statement Rollover, single-vehicle, weight, body mass index, Document is available to the public through the BMI, logistic, driver restraint use National Technical Information Service, Springfield, VA 22161 19. Security Classif. (of this report) 20. Security Classif. (of this page) 21. No of Pages 22. Price Unclassified Unclassified 89 Form DOT F1700.7 (8-72) Reproduction of completed page authorized NHTSA’s National Center for Statistics and Analysis 400 Seventh St., S.W., Washington, D.C. 20590 Table of Contents 1. Executive Summary ------------------------------------------------------------------------------ 1 2. Introduction---------------------------------------------------------------------------------------- 3 3. Introductory Tables ------------------------------------------------------------------------------- 7 4. Crash Avoidance ---------------------------------------------------------------------------------11 5. Rollover Propensity------------------------------------------------------------------------------13 Vehicle-Related Factors----------------------------------------------------------------------------13 Driver-Related Factors -----------------------------------------------------------------------------15 Other Factors ----------------------------------------------------------------------------------------28 6. Injury Outcomes ---------------------------------------------------------------------------------39 7. Fatalities Only ------------------------------------------------------------------------------------67 Weight, Height, and Body Mass Index-----------------------------------------------------------67 Fatalities by State -----------------------------------------------------------------------------------74 8. Logistic Analysis---------------------------------------------------------------------------------78 Rollover propensity---------------------------------------------------------------------------------78 Injury Outcomes ------------------------------------------------------------------------------------81 Discussion--------------------------------------------------------------------------------------------84 Appendix: Interpretation of Logistic Tables-----------------------------------------------------84 9. Conclusion ----------------------------------------------------------------------------------------86 10. References -------------------------------------------------------------------------------------87 NHTSA’s National Center for Statistics and Analysis 400 Seventh St., S.W., Washington, D.C. 20590 List of Tables Table 1 Passenger vehicle crashes and rollovers (regardless of the number of vehicles in the crash), 1994-2004 ................................................................................................................... 7 Table 2 Passenger vehicle occupants in vehicles that crashed and in vehicles that rolled over, 1994-2004 ............................................................................................................................... 8 Table 3 Passenger vehicle occupants by rollover status, injury severity, and ejection status, 1994- 2004......................................................................................................................................... 9 Table 4 Passenger vehicles in rollovers by vehicle type, 1994, 2003, 2004................................. 11 Table 5 Passenger vehicle drivers by rollover status and sex, 1994, 2003, 2004........................ 12 Table 6 Passenger vehicle drivers in rollovers by age, 1994, 2004.............................................. 12 Table 7 Vehicles in single-vehicle crashes ................................................................................... 13 Table 8 Vehicles in single-vehicle crashes by vehicle type, vehicle age, and rollover status, 1994, 2003, 2004................................................................................................................... 14 Table 9 Vehicles in single-vehicle crashes by vehicle type, whether the crash was speed-related, and rollover status, 1997, 2003, 2004................................................................................... 15 Table 10 Vehicles in single-vehicle crashes by vehicle type, driver restraint use, and rollover status, 1994, 2003, 2004 ....................................................................................................... 17 Table 11 Vehicles in single-vehicle crashes by vehicle type, driver age, and rollover status, 1994, 2003, 2004................................................................................................................... 18 Table 12 Vehicles with two occupants in single-vehicle crashes by vehicle type, driver and passenger age, and rollover status, 1994, 2003, 2004........................................................... 19 Table 13 Vehicles in single-vehicle crashes by vehicle type, driver sex, and rollover status, 1994, 2003, 2004................................................................................................................... 21 Table 14 Vehicles in single-vehicle crashes by vehicle type, alcohol involvement, and rollover status, 1994, 2003, 2004 ....................................................................................................... 23 Table 15 Vehicles in single-vehicle crashes by vehicle type, maneuver prior to critical event, and rollover status, 1994, 2003, 2004................................................................................... 24 Table 16 Vehicles in single-vehicle crashes by vehicle type, corrective action attempted, and rollover status, 1994, 2003, 2004.......................................................................................... 26 Table 17 Vehicles in single-vehicle crashes by vehicle type, number of vehicle occupants, and rollover status, 1994, 2003, 2004.......................................................................................... 28 Table 18 Vehicles in single-vehicle crashes by vehicle type, posted speed limit, and rollover status, 1994, 2003, 2004 ......................................................................................................
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