1. Key Laboratory of Highway Construction and Maintenance Technology in Loess Region of the Ministry of Transport, Shanxi Transportation Research Institute Group Co. Ltd., Taiyuan, Shanxi Province, People’s Republic of China
2. Shanxi Transportation Technology Research & Development Co., Ltd., Taiyuan, People’s Republic of China
3. Shanxi Traffic Maintenance Group, Taiyuan, People’s Republic of China
4. Jinzhong Branch of Shanxi Highway Bureau, Jinzhong, People’s Republic of China