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By any measure, the Millau viaduct will be breath-taking and another monument to the art of cable stayed bridges. The 160M structure will have six continuous main spans of 342m, and with two side spans of 204m, that makes a length of 2.46km. The road deck will glide up to 0.25km high over the Tarn Gorge when the A75 Clermont-Ferrand to Montpellier motorway is completed.