Lee Minwoo(Deputy Researcher, Business & Policy Research Division Korea Expressway Corporation Research Institute 24, Dontansunhwan-daero 17gil, Hwaseong-si Gyeonggi-do, Korea)
Cho Jinwoo(Principal Researcher, Business & Policy Research Division Korea Expressway Corporation Research Institute 24, Dontansunhwan-daero 17gil, Hwaseong-si Gyeonggi-do, Korea)
Corresponding author