1. M.S., Nebraska Dept. of Roads, 4425 S. 108th St., Omaha, NE 68145-0461, US e-mail: Barbara.gerbino-bevins@nebraska.gov
2. Ph.D., P.E. Professor of Civil Engineering, Univ. of Nebraska-Lincoln, Peter Kiewit Institute, 1110 South 67th St., Omaha, NE 68182-0178, US (Corresponding author), e-mail: ctuan@unomaha.edu
3. Nebraska Dept. of Roads, 1500 Highway 2, Lincoln, NE 68509-4759, US e-mail: mike.mattison@nebraska.gov