Investigating the effect of geometric dimensions of median traffic barriers on crashes: Crash analysis of interstate roads in Wyoming using actual crash datasets |
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| Institution: | 1. Department of Civil and Environmental Engineering, California Polytechnic State University, 1 Grand Ave, San Luis Obispo, CA 93407;2. Wyoming Technology Transfer Center, Department of Civil & Architectural Engineering, University of Wyoming, 1000 E. University Avenue, Dept. 3295, Laramie, WY 82071, United States;1. Insurance Institute for Highway Safety, 4121 Wilson Boulevard, 6th floor Arlington, VA 22203, United States;2. Westat, Inc., 1600 Research Blvd, Rockville, MD 20850, United States;1. The Center for Injury Research and Policy, Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH, United States;2. Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, United States;3. Graduate Center for Gerontology, College of Public Health, University of Kentucky, Lexington, KY, United States;4. Department of Civil Engineering, College of Engineering, University of Kentucky, Lexington, KY, United States;5. Division of Epidemiology, College of Public Health, The Ohio State University, Columbus, OH, United States;1. University of Paul Valery, Laboratoire Psy-DREPI (EA 7458), Esplanade Erasme, BP, 27877 - 21078 Dijon, France;2. University of Bourgogne Franche Comté, Laboratoire de Psychologie (EA 3188), 30 rue Mégevand, 25032 Besançon cedex, France;1. School of Civil and Construction Engineering, Oregon State University, 101 Kearney Hall, Corvallis, OR 97331, USA;2. School of Psychological Science, Oregon State University, 229 Reed Lodge, Corvallis, OR 97331, USA;1. Department of Management, Kochi University of Technology, 185 Miyanokuchi, Kami City, Kochi Prefecture, Japan;2. Research Organization for Regional Alliance, Kochi University of Technology, 185 Miyanokuchi, Kami City, Kochi Prefecture, Japan;3. Honda Motor Co., Ltd., 1-10-1 Shin Sayama, Sayama City, Saitama Prefecture, Japan;4. Nissho Electronics Corporation, 3-5, Nibancho, Chiyoda-ku, Tokyo, Japan;1. Department of Industrial Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan;2. Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS 66506, USA;3. Department of Electrical and Computer Engineering, Kansas State University, Manhattan, KS 66506, USA;4. Department of Statistics, Kansas State University, Manhattan, KS 66506, USA |
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| Abstract: | IntroductionDespite the numerous safety studies done on traffic barriers’ performance assessment, the effect of variables such as traffic barrier’s height has not been identified considering a comprehensive actual crash data analysis. This study seeks to identify the impact of geometric variables (i.e., height, post-spacing, sideslope ratio, and lateral offset) on median traffic barriers’ performance in crashes on interstate roads.MethodGeometric dimensions of over 110 miles median traffic barriers on interstate Wyoming roads were inventoried in a field survey between 2016 and 2018. Then, the traffic barrier data collected was combined with historical crash records, traffic volume data, road geometric characteristics, and weather condition data to provide a comprehensive dataset for the analysis. Finally, an ordered logit model with random-parameters was developed for the severity of traffic barrier crashes. Based on the results, traffic barrier’s height was found to impact crash severity.ResultsCrashes involving cable barriers with a height between 30″ and 42″ were less severe than other traffic barrier types, while concrete barriers with a height shorter than 32″ were more likely involved with severe injury crashes. As another important finding, the post-spacing of 6.1–6.3 ft. was identified as the least severe range in W-beam barriers.Practical applicationsThe results show that using flare barriers should reduce the number of crashes compared to parallel barriers. |
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| Keywords: | Median traffic barrier Traffic barrier dimensions Crash severity Random parameters ordered logit Wyoming |
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