1. Graduate Student Researcher, Univ. of California, Berkeley, Safe Transportation Research and Education Center, 2614 Dwight Way #7374, Berkeley, CA 94720-7374 (corresponding author).
2. Assistant Professor, Dept. of Urban Planning, Univ. of Wisconsin-Milwaukee, 2131 E. Hartford Ave., Milwaukee, WI 53211.
3. Assistant Professor, Dept. of Civil Engineering and Applied Mechanics, McGill Univ., Macdonald Engineering Bldg., 817 Sherbrooke St. West, Montréal, QC, Canada H3A 2K6.