1. Ph.D. Student, Univ. of Michigan, Dept. of Civil and Environmental Engineering, 2350 Hayward St., Room 1316, G.G. Brown Building, Ann Arbor, MI 48109.
2. Assistant Professor, Univ. of Michigan, Dept. of Civil and Environmental Engineering, 2350 Hayward St., Room 2340, G.G. Brown Building, Ann Arbor, MI 48109 (corresponding author).
3. Professor, Univ. of Michigan-Dearborn, College of Business, 19000 Hubbard Dr., Dearborn, MI 48128.