1. Ph.D. Candidate, School of Transportation, Southeast Univ., Nanjing, Jiangsu 210096, China (corresponding author).
2. Chair and Professor, Dept. of Civil Engineering, Catholic Univ. of America, Washington, DC 20064; and Professor, School of Transportation, Southeast Univ., Nanjing, Jiangsu 210096, China.
3. Assistant Professor, School of Engineering Technology, State Univ. of New York, Farmingdale, NY 11735; and Researcher, School of Transportation, Southeast Univ., Nanjing, Jiangsu 210096, China.