1. Ph.D. Candidate, Beijing Key Laboratory of Traffic Engineering, Beijing Univ. of Technology, Beijing 100124, China.
2. Lecturer, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, China.
3. Professor, Beijing Key Laboratory of Urban Transportation Operation Simulation and Decision Support, Beijing Transport Institute, Beijing 100000, China.
4. Professor, Beijing Key Laboratory of Traffic Engineering, Beijing Univ. of Technology, Beijing 100124, China (corresponding author).