1. Ph.D. Candidate, Beijing Key Laboratory of Traffic Engineering, Beijing Univ. of Technology, Beijing 100124, China.
2. Professor, Beijing Key Laboratory of Traffic Engineering, Beijing Univ. of Technology, Beijing 100124, China.
3. Lecturer, Beijing Key Laboratory of Traffic Engineering, Beijing Univ. of Technology, Beijing 100124, China (corresponding author).
4. Professor, Beijing Intelligent Transportation Development Center, Beijing 100161, China.