1. Graduate Engineer, Fugro Roadware, Inc., 8613 Cross Park Dr., Austin, TX 78754; formerly, Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 3127 Research Dr., State College, PA 16801 (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 208 Sackett Building, University Park, PA 16802.