National Highway 9 (Vietnam)
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National Highway 9 of Vietnam is a major east-west road crossing Quang Tri province. It links to Laotian Highway 9, and then Thai Highway 212. It intersects the principal north-south road, National Highway 1 at Dong Ha.
During the Vietnam War, Highway 9 was in South Vietnam, roughly parallelling the Demilitarized Zone from the coast to the Laotian border.