1. Ph.D. Candidate, Transportation College, Southeast Univ., Si Pai Lou #2, Nanjing 210096, P.R. China.
2. Professor, Intelligent Transportation System Research Center, Southeast Univ., Si Pai Lou #2, Nanjing 210096, P.R. China (corresponding author).
3. Professor, Intelligent Transportation System Research Center, Southeast Univ., Si Pai Lou #2, Nanjing 210096, P.R. China.
4. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695.