Jacques Ferrier Architectures new Choisy-le-Roi bridge crosses the RER C suburban express railway lines serving passenger traffic to and from the southern Paris region. The 70 m long bridge has a traffic lane in each direction contained within wide footpaths to either side. The need for uninterrupted traffic flow – with the exception of a two hour break at night – represented the point of departure for the project’s technical and architectural design. It resulted in the bridge being designed as a straight double beam preassembled on one side of the railway lines which was then pushed out over the tracks in two operations, a solution that ensured that the overall span did not require any intermediate supports.
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