1. Ph.D. Candidate, School of Transportation, Southeast Univ., Southeast University Rd. 2#, Nanjing 211100, PR China.
2. Master, School of Transportation, Southeast Univ., Southeast University Rd. 2#, Nanjing 211100, PR China.
3. Professor, School of Transportation, Southeast Univ., Southeast University Rd. 2#, Nanjing 211100, PR China (corresponding author).