It is a two-lane highway and is planned for 8-lane highway and will connect Cao Bằng Province by the Sino-Vietnamese border to Cà Mau Province with the total length of 3,167 km.
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As part of the punitive expedition against Vietnam for the occupation of Chinese-supported Democratic Kampuchea, Chinese forces entered northern Vietnam and advanced quickly about 15–20 kilometers into Vietnam, with fighting mainly occurring in the provinces of Cao Bằng, Lào Cai and Lạng Sơn.