1. Associate Professor, School of Transportation, Southeast Univ., 2 Sipailou, Nanjing 210096, China (corresponding author).
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, 96 Frelinguysen Rd., Piscataway, NJ 08854.
3. Associate Professor, School of Civil Engineering, Chongqing Jiaotong Univ., 66 Xuefu Rd., Chongqing 400074, China.
4. Professor, School of Transportation, Southeast Univ., 2 Sipailou, Nanjing 210096, China.
5. Associate Professor, College of Civil and Transportation Engineering, Hohai Univ., Nanjing 210098, China.