Pont autoroutier de Cubzac, Highway bridge in Cubzac-les-Ponts, France.
The Pont autoroutier de Cubzac, also called Pont de Guyenne, is a 1,160-metre reinforced-concrete viaduct carrying the A10 motorway over the Dordogne between Cubzac-les-Ponts and Saint-Vincent-de-Paul. It has 17 spans built from prefabricated voussoirs, with rectangular piers that have a narrow vertical slot in their upper section.
Built in 1974 by the Campenon-Bernard company, the bridge carried the A10 motorway over the Dordogne between Cubzac-les-Ponts and Saint-Vincent-de-Paul. It was doubled in 2000 with a parallel structure to take the growing traffic.
The bridge forms part of the engineering heritage of Nouvelle-Aquitaine region, representing the technological capabilities of French civil engineering during the 1970s.
The bridge carries the A10 motorway between Cubzac-les-Ponts and Saint-Vincent-de-Paul, so it is crossed by vehicle only, with no pedestrian or cycle path. To see it without driving, take the local roads of either commune down to the Dordogne bank and look up at the piers and the arch from the waterside.
The structure demonstrates an engineering choice to use prestressed concrete instead of traditional steel methods for river crossing. The parallel bridge addition was a clever solution that allowed traffic expansion without closing the original route.
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