1. Professor, School of Transportation, Southeast Univ., 2 Si Pai Lou, Nanjing 210096, China.
2. Engineer, Beijing Urban Construction Design & Development Group Co. Ltd., No. 5, Fuchengmen North St., Beijing 100034, China; formerly, Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 North Mathews Ave., Urbana, IL 61801.
3. Research Associate, School of Transportation, Southeast Univ., 2 Si Pai Lou, Nanjing 210096, China (corresponding author).
4. Graduate Research Assistant, School of Transportation, Southeast Univ., 2 Si Pai Lou, Nanjing 210096, China.