1. Main Roads of Western Australia, Don Aitken Centre, Waterloo Crescent, East Perth, WA 6004, Australia.
2. Professor, School of Civil and Resource Engineering, Univ. of Western Australia, 35 Stirling Highway, Crawley, WA 6009.
3. Assistant Professor, School of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.