1. Researcher, Dept. of Civil and Transport Engineering, Norwegian Univ. of Science and Technology, NO-7491 Trondheim, Norway. ORCID: .
2. Engineer, Norwegian Public Roads Administration, Abels Gate 5, NO-7030 Trondheim, Norway.
3. Professor, Dept. of Civil and Transport Engineering, Norwegian Univ. of Science and Technology, NO-7491 Trondheim, Norway (corresponding author)..