<P> Sweden was LHT from about 1734 to 1967, despite having land borders with RHT countries, and approximately 90 percent of cars being left - hand drive (LHD) vehicles . A referendum was held in 1955, with an overwhelming majority voting against a change to RHT . Nevertheless, some years later the government ordered a conversion, which took place at 5 am on Sunday, 3 September 1967 . The accident rate dropped sharply after the change, but soon rose back to near its original level . The day was known as Dagen H ("H - Day"), the' H' being for Högertrafik or right traffic . When Iceland switched the following year, it was known as H - dagurinn, again meaning "H - Day". </P> <P> In the late 1960s, the UK Department for Transport considered switching to RHT, but declared it unsafe and too costly for such a built - up nation . Road building standards, for motorways in particular, allow asymmetrically designed road junctions, where merge and diverge lanes differ in length . </P> <P> China adopted RHT in 1946 . Taiwan changed to driving on the right at the same time . Hong Kong and Macau continue to be LHT . </P> <P> Both North Korea and South Korea switched to RHT in September 1945 after liberation from Japan which was defeated and surrendered by the Allies . </P>

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