References: Japan (for):https://ink.library.smu.edu.sg/cgi/viewcontent.cgi?params=/context/soe_research/article/2530/&path_info=FundamentalLawHighwayCongesti...
References: Japan (for):https://ink.library.smu.edu.sg/cgi/viewcontent.cgi?params=/context/soe_research/article/2530/&path_info=FundamentalLawHighwayCongesti...