1. Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, Ministry of Transport, Beijing Jiaotong University, China;
2. Center for Transportation Research, The University of Tennessee, Knoxville, TN, USA;
3. Department of Civil & Environmental Engineering, The University of Tennessee, Knoxville, TN, USA;
4. National Demonstration Center for Experimental Traffic and Transportation Education, School of Traffic and Transportation, Beijing Jiaotong University, Beijing, China