1. Eminent Scholar Emeritus, Del E. Webb School of Construction, Arizona State Univ., P.O. Box 6700, Chandler, AZ 85246 (corresponding author). E-mail: cliff.s@asu.edu
2. Research Engineer, Texas Transportation Institute, 3135 Texas A&M Univ., College Station, TX 77843-3135. E-mail: g-ullman@tamu.edu
3. Professor, Dept. of Civil Engineering, Civil Engineering Lab Building, Room 115, Texas A&M Univ., College Station, TX 77843-3136. E-mail: s-anderson5@tamu.edu