1. Research Associate, School of Transportation, Southeast Univ., 2# Southeast University Rd., Jiangning District, Nanjing 211189, China.
2. Professor, School of Transportation, Southeast Univ., 2# Southeast University Rd., Jiangning District, Nanjing 211189, China (corresponding author).
3. Associate Professor, School of Transportation, Southeast Univ., 2# Southeast University Rd., Jiangning District, Nanjing 211189, China.