BRISA – Auto-Estradas de Portugal, SA
Oeiras, Lisbon, Portugal
The A5 Freeway has an East-West orientation and connects Lisbon’s centre to Cascais city, in a total extension of 25Km. The presented study refers to the improvement and enlargement for 2×4 lanes of two consecutive subsections of this freeway (nowadays with 2×3 lanes), the Estádio Nacional/Oeiras and the Oeiras/Carcavelos’ Sections, with lengths of 4,1 and 3Km, respectively. This improvement includes the redesign of the Estádio Nacional Interchange, which, including the complete redesign of some ramps, as well as the introduction of acceleration lanes at CREL’s entrance (Lisbon External Regional Ring), will increase significantly the traffic capacity and fluidity, due to the elimination of some of the existent cross-sections movements. The introduction of the fourth lanes in both subsections comprises the enlargement of the Barcarena and Laje Viaducts’ decks.