A9 motorway (Portugal)

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From Wikipedia, the free encyclopedia.

The A9 (CREL / Lisbon Regional Outer Circular) is a Portuguese motorway which, as the name indicates, forms a partial outer circular route beyond the north and western parts of the Lisbon conurbation. It thereby links the Estoril coastal area with principal highways towards the north of the country.

The road begins near to the National Stadium of Jamor and sets off in an approximately east-north-easterly direction, intersecting along the way with major regional roads ( IC19 , A16 , IC22 ) as well as two national motorways, the A8 and the A10. It passes Quelez in the edge of Sintra, then through the Odivlelas and Loures districts before ending after 35 kilometres (22 mi) at an intersection with the country’s principal northbound highway, the A1.

Despite running for its entire length within 20 kilometres (12 mi) of central Lisbon, much of the route of the A9 is semi-urban or rural, incorporating mountainous regions that necessitated the inclusion of 15 viaducts and two substantial tunnels in its construction.