1. Researcher, Dept. of Civil Engineering, Univ. of Toronto Transportation Research Institute, 35 St. George St., Toronto, ON, Canada M5S 1A4.
2. Postdoctoral Research Fellow, Dept. of Civil Engineering, Univ. of Toronto Transportation Research Institute, 35 St. George St., Toronto, ON, Canada M5S 1A4 (corresponding author).
3. Professor, Dept. of Civil Engineering, Univ. of Toronto Transportation Research Institute, 35 St. George St., Toronto, ON, Canada M5S 1A4.