The 4A and 4B viaducts cross the Travesso Valley near the Coimbra north interlink node with the A1 Motorway.
Both viaducts have end spans of 24m and current spans of 30m. The V4A viaduct is constituted of “A” and “D” branches, where the “A” branch has a total length of 588m. The V4B viaduct is constituted of “B” and “F” branches, the “B” branch being 708m long.
The decks are a two beam-and-slab shaped girder without cross-beams and are supported by pile/piers of 1.80m diameter.
Construction was completed in 2002.