Enlargement of the existing underpass through 2 laminar, monolithic, single span frames, with vertical walls founded by spread footings. The new underpass, with a 12.0m clear span and a 33.1m width, was built in several phases by the top-down method, with tangent pile walls. Both the upper road and the lower road were kept operational during the works. Services Provided: Preliminary Study, Final Design and Technical Assistance. Owner: Estradas de Portugal, S.A.