Map Viewing Service (WMS) of the dataset: Noise Zones (Type C Map, LN Index) of the RN98, 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《欧盟关于环境噪声评估与管理的2002/49/EC号指令（European Directive 2002/49/EC）》要求欧盟成员国对主要交通基础设施（陆地与航空）周边及大型聚居区的环境噪声开展评估。 该项评估主要通过编制所谓噪声地图开展，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。 《法国环境法典》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年及后续适当时机开展的复核工作，将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预测其变化趋势。 战略噪声地图的适用范围主要包括年车流量超过300万辆的道路基础设施。 针对主要公路与铁路交通基础设施，战略噪声地图的编制、审定与核准工作由所在省省长牵头实施。 噪声地图的编制需遵循欧盟指令规定的指标，即Lden（昼间-傍晚-夜间等效声级，Day Evening Night Level）与Ln（夜间等效声级，Night Level）。 • 昼间时段：[6时至18时] • 傍晚时段：[18时至22时] • 夜间时段：[22时至6时] Lden与Ln指标分别对应昼间、傍晚、夜间三个时段（Lden）及夜间时段（Ln）的能量加权平均值，最终结果以A计权分贝（A或dB(A)）表示。 C类噪声地图用于标注住宅、教育及医疗建筑所在区域的噪声值超出限值的范围。 针对公路与高速铁路线路，对应的噪声限值为Lden值68 dB(A)，Ln值62 dB(A)。