1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Reno, 1664 N. Virginia St., Reno, NV 89503 (corresponding author).
2. Research Engineer, ESC Inc., Turner Fairbank Highway Research Center, 6300 Georgetown Pike, McLean, VA 22101.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Nevada, Reno, 1664 N. Virginia St., Reno, NV 89503.
4. Senior Civil Research Engineer, Federal Highway Administration, Turner Fairbank Highway Research Center, 6300 Georgetown Pike, McLean, VA 22101.