1. Professor, Ministry of Transport Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, PR China.
2. Graduate Student, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, PR China.
3. Professor, Ministry of Transport Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, PR China (corresponding author).
4. Graduate Research Assistant, Dept. of Civil, Environmental, and Construction Engineering, Univ. of Central Florida, 12800 Pegasus Dr., Orlando, FL 32816.