1. Associate Professor, Univ. of Vermont, Burlington, VA 05405 (corresponding author).
2. Pavement Systems Engineer, New Hampshire Dept. of Transportation, Concord, NH 03302; formerly, Graduate Student, Univ. of New Hampshire, Durham, NH 03824.
3. Graduate Student, Univ. of Vermont, Burlington, VA 05405.
4. Deceased; formerly, Professor, Univ. of New Hampshire, Durham, NH 03824.
5. Associate Professor, Univ. of Illinois, Urbana, IL 61801.