1. Professor, School of Transportation, Southeast Univ., No. 2 Sipailou, Nanjing 210096, China; Professor and Chair, Dept. of Civil Engineering, Pangborn Hall, Catholic Univ. of America, 620 Michigan Ave., N.E., Washington, DC 20064.
2. Ph.D. Candidate, School of Transportation, Southeast Univ., No. 2 Sipailou, Nanjing 210096, China (corresponding author).
3. Research Engineer, Jiangxi Research Institute of Communication, No. 176 Lushan South Rd., Nanchang 330038, Jiangxi China.