1. School of Transportation and Civil Engineering, Nantong University, Nantong, China
2. School of Transportation, Southeast University, Nanjing, China
3. Key Laboratory of Transport Industry of Comprehensive Transportation Theory, College of Transportation Engineering, Tongji University, Shanghai, China
4. School of Management, Huazhong University of Science and Technology, Wuhan, China
5. Department of Civil, Structural and Environmental Engineering, University at Buffalo, Buffalo, NY, USA