Highway 1 (Street Without Joy), the main supply route along the north-south axis in South Vietnam, connected the port cities of Chu Lai and Da Nang with
Hue, Quang Tri, and the areas south of the Demilitarized Zone. Highway 1 ran through the Hai Van Pass at the boundary between Quang Nam and Thua
Tien provinces. The supply line was crucial to the American war effort, and over the years the army invested substantial effort in keeping it open, especially
when bad weather made aerial resupply of American troops impossible.
And Other Vietnam War Short Stories
http://www.vietnamwar.net