[1] Univ Sydney, Inst Transport & Logist Studies, Sydney, NSW 2000, Australia
[2] Worcester Polytech Inst, Foisie Sch Business, Worcester, MA 01609 USA
[3] Univ Loughborough, Sch Business & Econ, Management Sci & Operat Management Grp, Loughborough, Leics, England
[4] Univ Newcastle, Sch Math & Phys Sci, Newcastle, NSW 2300, Australia