1. Associate Professor, Intelligent Transportation Research Center, Southeast Univ., Nanjing 210096, China.
2. Ph.D. Candidate, School of Transportation, Southeast Univ., Nanjing 210096, China (corresponding author).
3. Lecturer, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, Tampa, FL 33620.
5. Graduate Research Assistant, School of Transportation, Southeast Univ., Nanjing 210096, China.