Noise zones (Map of type A, LD index) of the railway line Marseille Vintimille

European Directive 2002/49/EC of 25 June 2002 on evaluation and management environmental noise involves an assessment of environmental noise in the vicinity of major transport infrastructure (land and air) and in major agglomerations for EU Member States. This assessment is carried out in particular through the development of strategic ‘so-called’ noise maps. the first series were drawn up in 2007 (1st deadline of the Directive) and 2012 (2nd deadline). Article L572-5 of the Environmental Code states that these maps are “reviewed, and if necessary revised, at least every five years”. Thus, the implementation of this review leads, in 2017 and as appropriate, to revise or renew the maps previously developed. CBS are required in particular for railway infrastructure with annual traffic exceeding 30 000 train crossings per year; For major road and rail transport infrastructure, the CBS are established, decided and approved under the authority of the prefect of the department. Noise maps are developed according to the indicators established by the European Directive, namely Lden (Day Evening Night Level) and Ln (Night Level). • Day/day: [6h-18h] • Evening/evening: [18h-22h] • Night/night: [22h-6h] The Lden and Ln indicators correspond to a defined energy average over the periods (Day/Black/Night) for Lden and (Night) for Ln. The corresponding results are expressed in A or dB(A) weighted decibels. Areas exposed to noise (type A map): These are two cards representing • areas exposed to more than 55 dB(A) in Lden • areas exposed to more than 50 dB(A) in Ln They are presented in the form of isophone curves materialising areas of the same sound level and are plotted by step of 5 dB(A) from the threshold of 55 dB(A) in Lden and 50 dB(A) in Ln.2002年6月25日发布的欧盟《2002/49/EC号指令》（关于环境噪声的评估与管理）要求欧盟成员国对主要交通基础设施（陆路与航空）周边及大型城市群区域的环境噪声开展评估工作。此类评估主要通过制定战略性"所谓"噪声地图来实施。首批噪声地图分别于2007年（指令首个截止期限）与2012年（第二个截止期限）完成编制。《环境法典》第L572-5条规定，此类地图"至少每五年进行一次审查，必要时予以修订"。因此，该审查工作的推进使得2017年及后续适当时机需对此前编制的噪声地图进行修订或更新。 对于年过境列车超过3万列的铁路基础设施，需编制CBS。针对大型公路与铁路交通基础设施，CBS由所在省省长牵头制定、确定并审批。 噪声地图需依据欧盟指令规定的指标编制，即Lden（昼间夜间等效声级，Day Evening Night Level）与Ln（夜间等效声级，Night Level）： • 昼间：[6时-18时] • 晚间：[18时-22时] • 夜间：[22时-6时] Lden与Ln指标分别对应昼间、晚间、夜间时段（Lden）以及仅夜间时段（Ln）的加权能量平均值，计算结果以A计权分贝（dB(A)）或分贝（A）表示。 噪声暴露区域（A型地图）包含两类地图： • Lden指标超过55 dB(A)的噪声暴露区域 • Ln指标超过50 dB(A)的噪声暴露区域 此类地图以等声级线（isophone curves）形式呈现，用于标示相同声级的区域，其绘制步长为5 dB(A)，起始阈值分别为Lden指标的55 dB(A)与Ln指标的50 dB(A)。