Over time these towers suffered from alkali-silica reaction (‘Concrete cancer’) and were deemed no longer rational to maintain, necessitating the current, cable-stayed design.

The project was commissioned by Centre Expérimental de Recherches et d'Études du Bâtiment et des Travaux Publics (CEBTP) and cocontracted by VINCI Construction France, Campenon Bernard TP, GTM Génie Civil et Services and Sogea Bretagne.

Although Térénez is designed with an asymmetric form, observation of its cross-section shows that tensile loads in cables are transferred to the top of the towers in a rather symmetric manner.

The top of each pylon is in fact located above the centre of the deck’s cross-section and cables are evenly distributed on both sides of the tower.

Each pylon seems like a giant man standing inside the River Aulne with his legs spread out and steel cable arms holding the deck of the bridge.