1. Lead Research Engineer, National Center for Asphalt Technology, 277 Technology Parkway, Auburn, AL 36830 (corresponding author).
2. Professor, Dept. of Civil and Costal Engineering, Univ. of Florida, 265N Weil Hall, Gainesville, FL 32611.
3. Pavement Systems Research Engineer, Florida Dept. of Transportation, 5007 N.E. 39th Ave., Gainesville, FL 32609.