1. Associate Professor, Nanjing Vocational Institute of Transport Technology, 629 Longmian Rd., Nanjing, Jiangsu Province 211188, PR China.
2. Lecturer, College of Civil Science and Engineering, Yangzhou Univ., Yangzhou, Jiangsu Province 225127, PR China (corresponding author).
3. Postdoctoral Researcher, School of Transportation, Southeast Univ., Nanjing, 2 Sipailou, Nanjing 210096, PR China.