1. Assistant Professor, Beijing Key Laboratory of Traffic Engineering and Beijing Collaborative Innovation Center for Metropolitan Transportation, College of Metropolitan Transportation, Beijing Univ. of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China; Postdoctoral Research Fellow, School of Civil Engineering, Southwest Jiaotong Univ., 111 North Section 1, 2nd Ring Rd., Chengdu, Sichuan 610031, China.
2. Assistant Professor, College of Business Administration, Capital Univ. of Economics and Business, 121 Zhangjiakou Rd., Huaxiang, Fengtai District, Beijing 100070, China (corresponding author).
3. Assistant Professor, Beijing Key Laboratory of Multimedia and Intelligent Software, College of Metropolitan Transportation, Beijing Univ. of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
4. Professor and Gilbert, Cooper, W&W Steel Chair, School of Civil and Environmental Engineering, Oklahoma State Univ., Stillwater, OK 74074; Professor, School of Civil Engineering, Southwest Jiaotong Univ., 111 North Section 1, 2nd Ring Rd., Chengdu, Sichuan 610031, China.