1. Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 212 Sackett Bldg., University Park, PA 16802.
2. Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 208 Sackett Bldg., University Park, PA 16802.
3. The Thomas D. Larson Pennsylvania Transportation Institute, Pennsylvania State Univ., 201 Transportation Research Bldg., University Park, PA 16802.