1. Visiting Assistant Professor, Civil Engineering, Univ. of Tennessee at Chattanooga, 615 McCallie Ave. Dept. 2502, Chattanooga, TN 37403; formerly, Graduate Research Assistant, Auburn Univ., 101F Harbert Engineering Center, Auburn, AL 36849 (corresponding author).
2. Director, Highway Research Center; Associate Professor, Auburn Univ., 238 Harbert Engineering Center, Auburn, AL 36849.
3. Associate Professor, Auburn Univ., 238 Harbert Engineering Center, Auburn, AL 36849.