1. Research Fellow, Infrastructure Research Division, Korea Research Institute for Human Settlements, 5 Gukchaegyeonguwon-ro, Sejong-si, 30149, South Korea (corresponding author). ORCID: .
2. Research Fellow, Dept. of Public Finance and Social Policy, Korea Development Institute, 263 Namsejong-ro, Sejong-si, 30149, South Korea.
3. Professor, Civil and Environmental Engineering, Director of the Center for Transportation Research, Univ. of Tennessee, 600 Henley St., Suite 309, Knoxville, TN 37996-4133. ORCID: .