1. School of Transportation, Wuhan University of Technology, 1178 Heping Avenue, Yangyuan Street Office, Wuchang District, Wuhan 430063, China
2. School of Automotive and Traffic Engineering, Hubei University of Arts and Science, 296 Longzhong Road, Xiangyang 441053, China
3. College of Metropolitan Transportation, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China