1. Assistant Professor, Mississippi State Univ., Dept. of Civil and Environmental Engineering, 501 Hardy Road, 235 Walker Hall, MSU, MS 39762 (corresponding author).
2. Assistant Professor, Univ. of Oklahoma, School of Civil Engineering and Environmental Science, 202 W. Boyd Street, Room 334, Norman, OK 73019.
3. Civil Engineer, Oklahoma Dept. of Transportation, 200 N.E. 21st Street, Oklahoma City, OK 73105.