Predicting injury severity and crash frequency:Insights into the impacts of geometric variables on downgrade crashes in Wyoming

作     者：Milhan Moomen Mahdi Rez apour Mustaffa NRaja Khaled Ksaibati Milhan Moomen;Mahdi Rezapour;Mustaffa N.Raja;Khaled Ksaibati

作者机构：Department of Civil&Architectural EngineeringUniversity of WyomingLaramieWY 82071USA Wyoming Technology Transfer CenterUniversity of WyomingLaramieWY 82071USA 

出 版 物：《Journal of Traffic and Transportation Engineering(English Edition)》 (交通运输工程学报（英文版）)

年 卷 期：2020年第7卷第3期

页      面：375-383页

核心收录：

学科分类：03[法学] 08[工学] 0838[工学-公安技术] 0306[法学-公安学] 

基　　金：part of project#RS08216 funded by WYDOT 

主　　题：Traffic safety Downgrade Crash frequency Truck safety Geometric factor 

摘      要：Road deaths,injuries and property damage places a huge burden on the economy of most *** has one of the highest truck-related fatality rates among the states in the *** high crash rates observed in the state is as a result of many factors mainly related to the challenging mountainous terrain in the state,which places extra burden on truck drivers in terms of requiring higher levels of alertness and driving *** difficult geometry of roads characteristic of mountainous terrain in terms of steep grade lengths adds extra risks of fatalities or injuries occurring as a result of a *** risks are more pronounced for truck-related crashes due to their weight and *** part of the measures to reduce the incidence of truck-related crashes on mountainous areas,the Wyoming Department of Transportation(WYDOT)initiated a study to investigate causes of truck crashes on downgrade areas of *** studies have investigated the contributory factors to severe injury crashes but the focus has mostly been on level *** study analyzed the contributory geometric factors of truck crashes on downgrades by estimating three crash prediction negative binomial *** models took into account the injury severity of the *** results indicate that downgrade length,shoulder width,horizontal curve length,number of lanes,number of access points and truck traffic on the highway all impact truck-related crashes and injury frequencies ondowngrades in *** results of this study will be helpful to future downgrade road design policy aimed at reducing downgrade truck related crashes.