1. Associate Professor, Dept. of Computer Technology, Hebei Vocational Univ. of Industry and Technology, No. 626, Hongqi St., Shijiazhuang 050091, China.
2. Senior Engineer, Command Dept., Shijiazhuang Fangzhou Highway Engineering Test Testing Co., Ltd., No. 231, North West Second Ring Rd., Shijiazhuang 050051, China.
3. Senior Engineer, Experimental Dept., Shijiazhuang Hongye Traffic Construction Supervision Co., Ltd., No. 381, Taihua St., Shijiazhuang 050081, China.
4. Senior Engineer, Engineering Dept., Shijiazhuang Hongye Traffic Construction Supervision Co., Ltd., No. 381, Taihua St., Shijiazhuang 050081, China.
5. Assistant, Faculty of Science, Univ. of Hong Kong, Pokfulam, Hong Kong 999077, China.
6. Master Supervisor and Associate Professor, School of Traffic and Transportation, Shijiazhuang Tiedao Univ., No. 17, East North Second Ring Rd., Shijiazhuang 050043, China (corresponding author).