1. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology Beijing Jiaotong University, Haidian District, Beijing, China
2. National Engineering Research Center of Road Maintenance Technologies, Haidian District, Beijing, P. R. China
3. Research Institute of Highway, Ministry of Transportation, Haidian District, Beijing, P. R. China
4. Beijing Zhongjiao Ruida Technology Co. Ltd., Beijing, China