1. Master Student, School of Traffic and Transportation, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, PR China. ORCID: .
2. Professor, School of Traffic and Transportation, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, PR China (corresponding author).
3. Lecturer, School of Foreign Languages, Wuhan Textile Univ., No. 101 Yangguang Avenue, Jiangxia District, Wuhan 430200, PR China.
4. Master Student, School of Traffic and Transportation, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, PR China.