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The first section of the highway – connecting the Duarte Pacheco Viaduct in the City of Lisbon with the National Stadium in the Oeiras Municipality – was opened in 1944, becoming the first motorway in Portugal and one of the first in the world. From 1945 to the early 1980s, it was officially designated National Road 7 (N7), when it became the A5. The last section of the A5 was opened in 1991.
