1. School of Traffic and Transportation, Lanzhou Jiaotong University, Anning West Rd. #88, 730070 Lanzhou, China
2. Department of Transportation Engineering, Tongji University, Caoan Rd. #4800, 201804 Shanghai, China
3. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Luoyu Rd. #1037, 430074 Wuhan, China
4. School of Mechanical and Automotive Engineering, Qingdao University of Technology, Jialingjiang East Rd. #777, 266520 Qingdao, China
5. College of Traffic and Transportation, Chongqing Jiaotong University, XueFu Rd. #66, 400074 Chongqing, China