1. Department of Transportation and Logistics, Southwest Jiaotong Univeristy, Sichuan, People’s Republic of China
2. Department of Civil and Environmental Engineering, Rutgers, the State University of New Jersey, Piscataway, NJ, USA
3. Scientific Research Institute, Ministry of Transport of P.R.C., People’s Republic of China
4. College of Transportation Engineering, Chang’an University, Shaanxi, People’s Republic of China