1. Ph.D. Student, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji Univ., Shanghai 201804, China.
2. Professor, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji Univ., Shanghai 201804, China.
3. Ph.D. Student, Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji Univ., Shanghai 201804, China (corresponding author).
4. Assistant Professor, Dept. of Transport and Communications, Shanghai Maritime Univ., Shanghai 201306, China.