1. Department of Civil Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada.
2. Institute for Transport Planning and Systems, ETH Zurich, HIL F 51.1, Wolfgang-Pauli-Strasse 15, CH-8093 Zurich, Switzerland.
3. Cities Center, Department of Civil Engineering, University of Toronto, Suite 400, 455 Spadina Avenue, Toronto, Ontario M5S 2G8, Canada.