1. Professor, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, China; mailing address: No. 3 Shangyuancun Rd., Haidian District, Beijing 100044, China.
2. Professor, College of Metropolitan Transportation, Beijing Univ. of Technology, Beijing 100044, China; mailing address: No. 100 Pingleyuan Rd., Chaoyang District, Beijing 100044, China (corresponding author). ORCID: .
3. Assistant Professor, College of Metropolitan Transportation, Beijing Univ. of Technology, Beijing 100044, China; mailing address: No. 100 Pingleyuan Rd., Chaoyang District, Beijing 100044, China.