Built mainly by military forces, the road had a high financial and human cost. Work was carried out in an alpine climate, at an elevation of 2,000 meters (6,600 ft), using roughly six million kilograms (5,900 long tons; 6,600 short tons) of dynamite, and employing junior military personnel who were untrained in blasting techniques. Many workers died; official records state that only 40 soldiers lost their lives, but unofficial estimates by workers put the number in the hundreds.

The road was officially opened on 20 September 1974, although work, particularly paving of the roadbed, continued until 1980