1. Assistant Professor, Dept. of Civil Engineering, Parks College of Engineering, Aviation and Technology, 3450 Lindell Blvd., McDonnell Douglas Hall Room 2051, Saint Louis Univ., St. Louis, MO 63103; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Washington, Box 352700, Seattle, WA 98195-2700 (corresponding author).
2. Director, Washington State Transportation Center (TRAC), Univ. of Washington, Box 354802, University District Building, 1107 NE 45th St., Suite 535, Seattle, WA 98105-4631.
3. Ph.D. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Box 352700, Seattle, WA 98195-2700.
4. Assistant Professor, Civil and Environmental Engineering, Georgia Inst. of Technology, 790 Atlantic Dr., Atlanta, GA 30332-0355; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Washington.