1. Assistant Professor, School of Management, Shanghai Univ., Shanghai 200444, China.
2. Associate Professor, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom 999077, Hong Kong SAR (corresponding author).
3. Ph.D. Candidate, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom 999077, Hong Kong SAR.
4. Professor, Institute of Highway Engineering, RWTH Aachen Univ., 52056 Aachen, Germany.