Noisebel. prov. roads Lnight 2006

dataset contains the 50 dB, 55 dB, 60 dB, 65 dB and 70 dB Lnight sound contours of the provincial roads of the Province of Utrecht from the 1st tranche EU Environmental Noise Directive (year 2006). It concerns roads with annual intensity of & 6 million motor vehicles. noise maps are valid for reference year 2006 and only reflect the calculations related to the EU Environmental Noise Directive for the provincial roads of Utrecht.本数据集包含乌得勒支省（Province of Utrecht）省级公路的50 dB、55 dB、60 dB、65 dB及70 dB夜间Lnight噪声等值线，数据源自2006年第一批次的《欧盟环境噪声指令（EU Environmental Noise Directive）》。所涉道路的年度机动车通行量不低于600万辆。本噪声地图以2006年为参考基准年，且仅针对乌得勒支省省级公路，反映符合该指令的相关计算结果。