1. Halcrow Group, Vineyard House, 44 Brook Green, Hammersmith, London W6 7BY, United Kingdom.
2. Center for Transportation and Logistics, Room 1-274, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139.
3. Department of Civil and Environmental Engineering, Room 1-238, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139.