1. Lecturer, School of Highway, Chang’an Univ., Nan Er Huan Zhong Duan, Xi’an City 710064, China.
2. Dean and Professor, School of Transportation Science and Engineering, Harbin Institute of Technology, No. 73, Huanghe Rd., Nangang District, Harbin 150090, China (corresponding author).
3. University President and Professor, School of Highway, Chang’an Univ., Nan Er Huan Zhong Duan, Xi’an City 710064, China.