1. Associate Professor, College of Civil and Transportation Engineering, Hohai Univ., Nanjing, Jiangsu 210098, PR China; Associate Professor, Jiangsu Technology Industrialization and Road Engineering, Suzhou Univ. of Science and Technology, Suzhou 215011, PR China.
2. Research Assistant, School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, PR China (corresponding author).
3. Research Assistant, School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, PR China.
4. Professor, School of Traffic and Transportation Engineering, Changsha Univ. of Science and Technology, Changsha 410114, PR China; Professor, College of Civil and Transportation Engineering, Hohai Univ., Nanjing, Jiangsu 210098, PR China.
5. Research Assistant, College of Civil and Transportation Engineering, Hohai Univ., Nanjing, Jiangsu 210098, China.