1. Associate Professor, School of Transportation Engineering, Southeast Univ., Nanjing 211189, China (corresponding author).
2. Associate Professor, Rail Transportation Engineering, Pennsylvania State Univ., Altoona, PA 16601.
3. Assistant Professor, Dept. of Civil, Coastal, and Environmental Engineering, Univ. of South Alabama, Mobile, AL 36695.
4. Research Assistant, School of Transportation Engineering, Southeast Univ., Nanjing 211189, China.
5. Irma Louise Rush Stewart Distinguished Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.