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A 2004 prefectural decree defines acoustic zones for land transport infrastructure in Finistère, France, including a section straddling Morbihan. The Bureau de Recherches Géologiques et Minières provides these data as the latest available, segmented by municipality. The zones are not prohibitive but require facade isolation calculations for new buildings.
Data is to be used in conjunction with the axis table (L_CLASSEMENT_SONORE_2004_S_029).