Quality assessment between calibrated highway safety manual safety performance functions and calibration functions for predicting crashes on freeway facilities

作     者：Imalka C.Matarage Sunanda Dissanayake Imalka C.Matarage;Sunanda Dissanayake

作者机构：Department of Civil EngineeringKansas State UniuersityManhattanKS 66502USA 

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1期

页      面：76-87页

核心收录：

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：supported by the Kansas Department of Transportation(KDOT)under the K-TRAN program 

主　　题：Transportation Freeway segments Speed-change lanes Crash prediction models Goodness-of-fit measures Calibration factor 

摘      要：Crash prediction models are commonly used for network screening in highway safety management process,where potential impacts of highway safety treatments are *** Highway Safety Manual(HSM)provides crash prediction models for various types of highway facilities that are often referred to as safety performance functions(SPFs).Freeway facility SPFs in the HSM were developed using data gathered from the states of California,Maine,and *** applying these HSM-default SPFs to a local jurisdiction,the HSM recommends calibration of HSM-default SPFs or development of jurisdiction-specific SPFs to improve the accuracy of crash *** study first calibrated the HSM-default freeway SPFs and for further accuracy and comparison purposes calibration functions were developed using Kansas freeway *** performance of calibrated HSM-default SPFs was then compared with developed calibration functions concerning the accuracy in crash *** facility calibration dataset included521 freeway segments,351 entrance-related speed-change lanes,and 366 exit-related speed-change *** residual plots and several other goodness-of-fit measures were used to assess the quality of calibrated HSM-default SPFs and calibration *** functions fitted better compared to calibrated HSM-default SPFs for Kansas freeway *** methodology used in this study could be beneficial and practiced to any *** functions could be used as an alternative to jurisdiction-specific SPFs or a replacement for HSM-default SPFs,which are frequently used in comparing alternatives,in calculating economic benefits of project improvements,and in estimating economic effectiveness of crash reduction in highway safety-related decision making.