1. Assistant Professor, Purdue Univ., School of Civil Engineering, 550 Stadium Mall Dr., West Lafayette, IN 47907-2051.
2. Assistant Professor, Oregon State Univ., Civil, Construction, and Environmental Engineering, Corvallis, OR 97331-2303.
3. Lecturer and Director of Transpeed, Univ. of Washington, Civil and Environmental Engineering, Box 352700, Seattle, WA 98195-2700.