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Investigating the influence of curbs on single-vehicle crash injury severity utilizing zero-inflated ordered probit models
Authors:Ximiao Jiang  Baoshan Huang  Russell L Zaretzki  Stephen Richards  Xuedong Yan  Hongwei Zhang
Affiliation:1. Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, United States;2. Department of Statistics, Operations & Management Science, The University of Tennessee, Knoxville, TN 37996, United States;3. MOE Key Laboratory for Transportation Complex Systems Theory and Technology, School of Traffic & Transportation, Beijing Jiaotong University, Beijing 100044, PR China;4. Chang’an University, Xi’an, Shanxi, PR China
Abstract:The severity of traffic-related injuries has been studied by many researchers in recent decades. However, previous research has seldom accounted for the effects of curbed outside shoulders on traffic-related injury severity. This study applies the zero-inflated ordered probit (ZIOP) model to evaluate the influences of curbed outside shoulders, speed limit change, as well as other traditional factors on the injury severity of single-vehicle crashes. Crash data from 2003 to 2007 in the Illinois Highway Safety Database were employed in this study.
Keywords:Traffic injury severity  Zero-inflated ordered probit model  Single-vehicle crashes  Curb  Shoulder  Speed limit
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