The impact of traffic barrier geometric features on crash frequency and injury severity of non-interstate highways |
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| Institution: | 1. Civil and Environmental Engineering, California Polytechnic State University, United States;2. South Carolina Department of Transportation, Columbia, SC, United States;3. Wyoming Technology Transfer Center, Department of Civil & Architectural Engineering, University of Wyoming, 1000 E. University Avenue, Dept. 3295 Laramie, WY 82071, United States;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 Civil and Environmental Engineering, Rutgers University, United States;2. Department of Statistics, Rutgers University, United States;3. Department of Statistics, Virginia Tech, United States;1. School of Labor and Employment Relations, University of Illinois at Urbana-Champaign, 504 E. Armory Ave, 247E LER Building, Champaign, IL 61820, United States;2. Department of Psychology, North Carolina State University, 640 Poe Hall, 2310 Katharine Stinson Dr., Raleigh, NC 27695-7650, United States;3. Department of Management and International Business, College of Business, Florida International University, Modesto A. Maidique Campus, 11200 S.W. 8th St, MANGO 472, Miami, FL 33199, United States;1. Spectrum Health/Michigan State University General Surgery Residency, Grand Rapids, MI, United States;2. Spectrum Health/Michigan State University Plastic Surgery Residency, Grand Rapids, MI, United States;3. Department of Surgery, Michigan State University, Grand Rapids, MI, United States;4. Trauma Research Institute, Division of Acute Care Surgery, Spectrum Health Hospital, Michigan State University College of Human Medicine, Grand Rapids, MI, United States;5. Division of Surgical Oncology, Spectrum Health Hospital, Michigan State University College of Human Medicine, Grand Rapids, MI, United States;6. Division of Acute Care Surgery, Spectrum Health Hospital, Michigan State University College of Human Medicine, Grand Rapids, MI, United States;7. Trauma Research Institute, Division of Acute Care Surgery, Spectrum Health Hospital, Grand Rapids, MI, United States;1. Department of Agribusiness and Applied Economics, North Dakota State University, United States;2. Department of Applied Economics, University of Minnesota, United States |
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| Abstract: | Introduction: The main objective of this research is to investigate the effect of traffic barrier geometric characteristics on crashes that occurred on non-interstate roads. Method: For this purpose, height, side-slope rate, post-spacing, and lateral offset of about 137 miles of traffic barriers were collected on non-interstate (state, federal aid primary, federal aid secondary, and federal aid urban) highways in Wyoming. In addition, crash reports recorded between 2008 and 2017 were added to the traffic barrier dataset. The safety performance of traffic barriers with regards to their geometric features was analyzed in terms of crash frequency and crash severity using random-parameters negative binomial, and random-parameters ordered logit models, respectively. Results: From the results, box beam barriers with a height of 27–29 inches were less likely to be associated with injury and fatal injury crashes compared to other barrier types. On the other hand, the likelihood of a severe injury crash was found to be higher for box beam barriers with a height taller than 31 inches. Both W-beam and box beam barriers with a post-spacing between 6.1 and 6.3 inches reduced the probability of severe injury crashes. In terms of the crash frequency, flare traffic barriers had a lower crash frequency compared to parallel traffic barriers. Non-interstate roads without longitudinal rumble strips were associated with a higher rate of traffic barrier crashes. |
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| Keywords: | Traffic barrier Crash severity Crash frequency Random-parameters negative binomial Random-parameters ordered logit |
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