[1] Dept. of Eng. and Public Policy, Carnegie Mellon University
[2] Department of Civil Engineering, Rose-Hulman Institute of Technology
[3] H. John Heinz, III, Sch. Pub. P./M., Carnegie Mellon University
[4] Off. of the Vice Provost for Educ., Carnegie Mellon University, 609a Warner Hall, 5000 Forbes Avenue, Pittsburgh, PA 15213
[5] Department of Civil Engineering, Rose-Hulman Institute of Technology, 5500 Wabash Avenue, Terre Haute, IN 47803
[6] H. John Heinz, III, Sch. Pub. P./M., Carnegie Mellon University, Hamburg Hall, Pittsburgh, PA 15213