1. Principal Engineer, Dept. of Transport and Main Roads, 1-5 Phillip St, Toowoomba, QLD 4350, Australia (corresponding author). ORCID: .
2. Emeritus Professor, School of Property Construction and Project Management, RMIT Univ., P.O. Box 2476, Melbourne, VIC 3001, Australia.
3. Professor, School of Civil Engineering and Built Environment, Faculty of Science and Engineering, Queensland Univ. of Technology, Level 7, S Block, 2 George St., Brisbane, QLD 4000, Australia.