1. Associate Professor, Intelligent Transportation System Research Center, Southeast Univ., Nanjing 210096, China (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of South Florida, Tampa, FL 33620.
3. Graduate Student, Intelligent Transportation System Research Center, Southeast Univ., Nanjing 210096, China.
4. Senior Engineer, Transportation Infrastructure Design and Research Institute, China Design Group Co., Ltd., Nanjing 210014, China.