1. Professor, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, 86400 Batu Pahat, Johor, Malaysia; Academic Visitor, Dept. of Infrastructure Engineering, Univ. of Melbourne, Parkville, VIC 3010, Australia (corresponding author).
2. Senior Lecturer, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, 86400 Batu Pahat, Johor, Malaysia.
3. Associate Professor, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, 86400 Batu Pahat, Johor, Malaysia.
4. Associate Professor, Dept. of Civil Engineering, Univ. of Nottingham, Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia.
5. Reader, Dept. of Engineering Science, Univ. of Greenwich, Kent ME4 4TB, U.K.
6. Professor, Dept. of Infrastructure Engineering, Univ. of Melbourne, Parkville, VIC 3010, Australia.