1. Louisiana Transportation Research Center, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808 US (Corresponding author), e-mail: cefars@lsu.edu
2. Dept. of Civil and Environmental Engineering, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808 US
3. Louisiana Transportation Research Center, Louisiana State Univ., 4101 Gourrier Ave., Baton Rouge, LA 70808 US