Table describing the Noise Zones of the major land transport infrastructure of the Gard department (Type A LN night)

Noise level zones describe a noise exposure situation based on a noise indicator or area affected by noise. They are used primarily for the preparation of strategic noise maps pursuant to Article R.572-5 of the Environmental Code. Noise zones are geometric elements of the strategic noise map. For type A maps (CBSTYPE), each noise zone is usually bounded by 2 isophone curves (Lden 55-60, 60-65, 65-70, 70-75 and Ln 50-55, 55-60, 60-65, 65-70) or shares the lower limit isophone curve (Lden >75, Ln > 70). The type B map locates the sectors affected by noise, defined by the noise classification of land transport infrastructure. For type C maps (CBSTYPE), each noise zone shall be bounded by the lower limit isophone curve (Lden > 68 or 73, Ln > 62 or 65).噪声级区域（Noise level zones）是基于噪声指标或受噪声影响范围，用以表征噪声暴露状况的单元。其主要用于依据《环境法典》第R.572-5条编制战略噪声地图。 噪声区域是战略噪声地图的几何构成要素。 对于A型地图（CBSTYPE），每个噪声区域通常以两条等声级线（isophone curve）划定边界，对应声级区间为Lden 55-60、60-65、65-70、70-75以及Ln 50-55、55-60、60-65、65-70；部分区域则共享下限等声级线，对应条件为Lden＞75、Ln＞70。 B型地图用于划定受噪声影响的片区，其划分依据为陆地交通基础设施的噪声分级。 对于C型地图（CBSTYPE），每个噪声区域需以下限等声级线划定边界，对应条件为Lden＞68或73、Ln＞62或65。