1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing, People’s Republic of China
2. M. E., Guangdong Hualu Transport Technology Co., Ltd, Guangzhou, People’s Republic of China
3. Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI, USA
4. College of Traffic & Transportation, Chongqing Jiaotong University, Chongqing, People’s Republic of China
5. Guangxi Communications Design Group Co., Ltd, Guangxi, People’s Republic of China