1. Professor, Construction Science, Univ. of Oklahoma, Norman, OK 73019-6141. E-mail: dgransberg@ou.edu
2. Instructor, Dept. of Construction, Southern Illinois Univ., at Edwardsville, Edwardsville, IL 62026-1803. E-mail: clopezd@siue.edu
3. Project Engineer, Oklahoma Turnpike Authority, Oklahoma City, OK 73134. E-mail: dhumphrey@ota.state.ok.us (405) 425-7449.