1. Associate Professor, School of Automobile and Traffic Engineering, Jiangsu Univ., Zhenjiang 212013, P.R. China (corresponding author).
2. Master, School of Automobile and Traffic Engineering, Jiangsu Univ., Zhenjiang 212013, P.R. China.
3. Master, Dept. of Land and Sea Transport Systems, Technical Univ. of Berlin, 10587 Berlin, Germany.
4. Professor, Dept. of Land and Sea Transport Systems, Technical Univ. of Berlin, 10587 Berlin, Germany.