1. Professor, Jiangsu Key Laboratory of Urban ITS, Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, Southeast Univ., Si Pai Lou #2, Nanjing 210096, China (corresponding author).
2. Ph.D. Candidate, Jiangsu Key Laboratory of Urban ITS, Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, Southeast Univ., Si Pai Lou #2, Nanjing 210096, China.
3. Professor, Dept. of Civil Engineering, Auburn Univ., 238 Harbert Engineering Center, Auburn, AL 36849-5337.
4. Assistant Professor, National Key Laboratory of Air Traffic Flow Management, College of Civil Aviation, Nanjing Univ. of Aeronautics and Astronautics, Jiangjun Rd. No. 29, Nanjing 211106, China.