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http://dx.doi.org/10.7855/IJHE.2011.13.4.199

Analysis of Traffic Crash Severity on Freeway Using Hierarchical Binomial Logistic Model  

Mun, Sung-Ra (서울대학교 환경대학원)
Lee, Young-Ihn (서울대학교 환경대학원)
Publication Information
International Journal of Highway Engineering / v.13, no.4, 2011 , pp. 199-209 More about this Journal
Abstract
In the study of traffic safety, the analysis on factors affecting crash severity and the understanding about their relationship is important to be planning and execute to improve safety of road and traffic facilities. The purpose of this study is to develop a hierarchical binomial logistic model to identify the significant factors affecting fatal injuries and vehicle damages of traffic crashes on freeway. Two models on death and total vehicle damage are developed. The hierarchical structure of response variable is composed of two level, crash-occupant and crash-vehicle. As a result, we have gotten the crash-level random effect from these hierarchical structure as well as the fixed effect of covariates, namely odds ratio. The crash on the main line and in-out section have greater damage than other facilities. Injuries and vehicle damages are severe in case of traffic violations, centerline invasion and speeding. Also, collision crash and fire occurrence is more severe damaged than other crash types. The surrounding environment of surface conditions by climate and visibility conditions by day and night is a significant factor on crash occurrence. On the orher hand, the geometric condition of road isn't.
Keywords
crash severity; hierarchical binomial logistic model; odds ratio;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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