1. Professor, Civil and Environmental Engineering, Univ. of Nebraska, Lincoln, NB 68588.
2. Assistant Professor, Civil and Environmental Engineering, West Virginia Univ., Morgantown, WV 26506.
3. Associate Professor, Civil Engineering Dept., Univ. of Minnesota, Minneapolis, MN 55455.
4. Director, Transportation and Infrastructure, American Iron and Steel Institute, Washington, DC 20036.