1. Postdoctoral Scholar, Univ. of California Pavement Research Center, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, One Shields Ave., Davis, CA 95616 (corresponding author).
2. Professor, Univ. of California Pavement Research Center, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, One Shields Ave., Davis, CA 95616.