The National Natural Science Foundation of China(No.51408229,51278202);the Program of the Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University(No.K201204);the Science and Technology Program of Guangdong Communication Department(No.2013-02-068)
In order to improve the prediction precision of the safety performance function (SPF) of freeway basic segments, design and crash data of 640 segments are collected from different institutions. Three negative binomi...