1. Lecturer, School of Transportation and Logistics, Southwest Jiaotong Univ., West Park of Hi-Tech Zone, Chengdu, Sichuan 611756, China; National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Chengdu, Sichuan 611756, China.
2. Lecturer, School of Transportation and Logistics, Southwest Jiaotong Univ., West Park of Hi-Tech Zone, Chengdu, Sichuan 611756, China.
3. Professor, College of Transportation Engineering, Chang’an Univ., Xi’an, Shaanxi 710064, China; John A. Reif, Jr. Dept. of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102-1982 (corresponding author).