1. Department of Traffic Engineering, College of Transportation Engineering, Chang’an University, Xi’an, Shaanxi, China
2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri, USA
3. Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, Pennsylvania, USA
4. School of Transportation Engineering, Southeast University, Nanjing, China
5. School of Architecture and Urban Planning, Guangdong University of Technology, Guangzhou, Guangdong, China