1. Associate Professor, School of Transportation, Southeast Univ., 2 Sipailou, Nanjing 210096, People’s Republic of China (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, New Brunswick, NJ 08854.
3. Professor, School of Civil Engineering, Chongqing Jiaotong Univ., Chongqing 400074, People’s Republic of China.
4. Graduate Research Assistant, School of Transportation, Southeast Univ., 2 Sipailou, Nanjing 210096, People’s Republic of China.