1. Guanxi Liubin Expressway Construction & Development Co., Ltd., Nanning 530023, China
2. Guanxi Nanning Second Ring Expressway Co., Ltd., Nanning 530029, China
3. Guangxi Communication Design Group Co., Ltd., Nanning 530029, China
4. College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China