Viaducts 4 and 5 over Barranco do Ribeiro in A2 – Almodôvar/ S. Bartolomeu de Messines Stretch. Viaduct 4 with a total length of 145m divided by 4 spans with the following lengths: 36, 46, 36 and 27m. Viaduct 5 with a total length of 248m divided by 2 outer spans with a length of 24m and 5 inner spans with a length of 40m each. Decks with prestressed concrete beams, built by using a launching beam, and with ground clearances up to 52m. The piers are vertical and “T” shaped, and support the beams through two bearings, one per beam. Services Provided: Preliminary Study, Final Design and Technical Assistance. Owner: Brisa – Auto Estradas de Portugal, S.A.