1. Graduate Student, Safe Transportation Research and Education Center, Univ. of California, Berkeley, 2614 Dwight Way #7374, Berkeley, CA 94720-7374.
2. Postdoctoral Researcher, Safe Transportation Research and Education Center, Univ. of California, Berkeley, 2614 Dwight Way #7374, Berkeley, CA 94720-7374.
3. Co-Director, Safe Transportation Research and Education Center, Univ. of California, Berkeley, 2614 Dwight Way #7374, Berkeley, CA 94720-7374 (corresponding author).
4. Senior Transportation Engineer, California Dept. of Transportation, 1120 N St., Sacramento, CA 95814.