Influence of geometric design characteristics on safety under heterogeneous traffic flow

作     者：Praveen Vayalamkuzhi Veeraragavan Amirthalingam 

作者机构：Department of Civil EngineeringIndian Institute of Technology MadrasChennai 600036India 

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：2016年第3卷第6期

页      面：559-570页

学科分类：08[工学] 082303[工学-交通运输规划与管理] 082302[工学-交通信息工程及控制] 0823[工学-交通运输工程] 

基　　金：Ministry of Human Resource Development  Govt. of India 

主　　题：Road safety Geometric design Regression modelling Road crash Heterogeneous traffic flow 

摘      要：This paper focuses on analysing the influence of geometric design characteristics on traffic safety using bi-directional data on a divided roadway operated under heterogeneous traffic conditions in India. The study was carried out on a four lane divided inter-city highway in plain and rolling terrain. Statistical modelling approach by Poisson regression and Negative binomial regression were used to assess the safety performance as occurrence of crashes are random events and to identify the influence of the geometric design variables on the crash frequency. Negative binomial regression model was found to be more suitable to identify the variables contributing to road crashes. The study enabled better understanding of the factors related to road geometrics that influence road crash frequency. The study also established that operating speed has a significant contribution to the total number of crashes. Negative binomial models are found to be appropriate to predict road crashes on divided roadways under heterogeneous traffic conditions.