Noise Zones (Type C Map, LD Index) of the A570, unlicensed national road network

European Directive 2002/49/EC of 25 June 2002 on the assessment and management of environmental noise entails for EU Member States an assessment of environmental noise in the vicinity of major transport infrastructure (land and air) and in large agglomerations. This assessment is carried out in particular through the development of ‘so-called’ noise maps, the first series of which 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. Strategic Noise Maps (CBS) are designed to allow for the overall assessment of exposure to noise and to forecast its evolution. CBS are required in particular for road infrastructure with annual traffic of more than 3 million vehicles 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. Type C maps represent areas where noise limit values are exceeded for residential, educational and health buildings. For road and high-speed railway lines, the limit values are 68 dB(A) in Lden and 62 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）周边及大型聚居区的环境噪声开展评估。 该评估主要通过绘制“所谓”噪声地图完成，首批噪声地图分别于2007年（指令首个截止期限）和2012年（第二个截止期限）编制完成。 《环境法典》第L572-5条规定，此类地图“至少每五年进行一次复核，必要时予以修订”。因此，2017年及后续适时开展的复核工作，需对此前编制的噪声地图进行修订或更新。 战略噪声地图（Strategic Noise Maps, CBS）旨在实现噪声暴露的整体评估，并对其变化趋势进行预测。 战略噪声地图的编制要求适用于年车流量超过300万辆的道路基础设施。对于大型公路与铁路交通基础设施，战略噪声地图由所在省省长负责审批、确定并核准。 噪声地图的编制需遵循欧盟指令规定的评价指标，即等效昼夜声级（Lden, Day Evening Night Level）与夜间等效声级（Ln, Night Level）： • 日间时段：[6时至18时] • 晚间时段：[18时至22时] • 夜间时段：[22时至次日6时] Lden与Ln指标分别对应各时段（日间、晚间、夜间，针对Lden；仅夜间时段，针对Ln）的能量平均值，计算结果以A计权分贝（dB(A)）表示。 C类地图用于标注住宅、教育及医疗建筑所在区域的噪声限值超标情况。对于公路与高速铁路线路，其噪声限值为：Lden指标不超过68 dB(A)，Ln指标不超过62 dB(A)。