1. Ph.D. Candidate, School of Transportation, Southeast Univ.; and Visiting Scholar, Safe Transportation Research and Education Center, Institute of Transportation Studies, Univ. of California, Berkeley, Si Pai Lou, Number 2, Nanjing, China 210096 (corresponding author).
2. Professor, School of Transportation, Southeast Univ., Si Pai Lou, Number 2, Nanjing, China 210096.
3. M.P.H., Safe Transportation Research and Education Center, Institute of Transportation Studies, Univ. of California, Berkeley, 2614 Dwight Way, Number 7374, Berkeley, CA 94720-7374.
4. Professor, Safe Transportation Research and Education Center, Institute of Transportation Studies, Univ. of California, Berkeley, 2614 Dwight Way, Number 7374, Berkeley, CA 94720-7374.