One of the most critical points, from the technical point of view, will be the ring closure that will serve as the bypass road of Seville’s metropolitan area (SE-40). It is located in the stretch Dos Hermanas (A-4) - Coria del Río (A-8058).
Ayesa is responsible of the project’s drafting of the entire route with a five kilometer length, from which two and a half kilometers will be affected with a projected route for a passage under the river. Such passage has been resolved with four tunnels holding two lanes each. With this approach, each way will have two tunnels and therefore, four lanes, which projects as an exit, a superior transversal section superior to the rest of the SE-40 that will have three lanes for each way, with the added adaptability to expand to four lanes in the near future.
In the installation stage, it should be noted because of its importance, there are plans for ventilation, exterior and interior lightning, the fixed signaling, and variable panels within and around the project, as well as the control system. All this is designed according to maximum safety advances in similar tunnels and clearly with a strict adherence with the legislation that governs the minimum safety requirements in highway tunnels.
These tunnels are framed within the urban or periurban tunnels, which are part of the landscaping layout of the city. They should have a formal concept that enhances the environment. A tunnel under the Guadalquivir, at the Lake Tharsis, the cradle of Tartesos, and the venue of ancient legends, should be remembered as the atlantes deeds from which it takes its name. This is an epic structure for an epic and mysterious place.