1. Doctoral Candidate, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji Univ., Shanghai 200092, China.
2. Professor, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji Univ., Shanghai 200092, China.
3. Professor, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China (corresponding author).
4. Doctoral Candidate, School of Transportation Science and Engineering, Beihang Univ., No. 37 Xueyuan Rd., Haidian District, Beijing 100191, China.