1. Federal Highway Administration, HIBT-10, 1200 New Jersey Ave., Washington, DC 20590 (corresponding author).
2. Purdue Univ. School of Civil Engineering, 550 Stadium Mall Dr., West Lafayette, IN 47907.
3. HDR Engineering, 9987 Carver Rd., Cincinnati, OH 45242.
4. Univ. of Delaware, 358B DuPont Hall, Newark, DE 19716.