1. School of Transportation and Logistics, Southwest Jiaotong University, Chengdu, China
2. Faculty of Transportation Engineering, Kunming University of Science and Technology, Kunming, China
3. SMART Infrastructure Facility, University of Wollongong, Wollongong, NSW, Australia
4. School of Transportation and Logistics, the National United Engineering Laboratory of Integrated and Intelligent Transportation, and the National Engineering Laboratory of Integrated Transportation Big Data Application Technology, Southwest Jiaotong University, Chengdu, China