[1] Univ Sydney, Inst Transport & Logist Studies, 378 Abercrombie St, Sydney, NSW 2008, Australia
[2] Univ Leeds, Inst Transport Studies, 30-40 Univ Rd, Leeds LS2 9JT, W Yorkshire, England
[3] Univ Leeds, Choice Modelling Ctr, 30-40 Univ Rd, Leeds LS2 9JT, W Yorkshire, England
[4] ETH, Inst Transport Planning & Syst IVT, Stefano Franscini Pl 5, CH-8093 Zurich, Switzerland