Major Road Noise Contours Lnight Round 2

Data indicating the level of noise according to the strategic noise mapping of major road sources within areas with a population of at least 100,000 people (agglomerations) and along major traffic routes with more than 3,000,000 vehicle passages per year. Lnight indicates night time annual average noise level results in dB, where night is defined as 2300 - 0700.This data is a product of the strategic noise mapping analysis undertaken to meet the requirements of the Environmental Noise Directive (Directive 2002/49/EC).

本数据集反映了至少拥有十万人口（城市群）及沿主要交通路线（年车辆通行量超过三百万次）的战略性噪声映射中的噪声水平。Lnight 表示夜间年度平均噪声水平，单位为分贝，夜间时间定义为 2300 至 0700 时段。该数据集为战略性噪声映射分析的结果，旨在满足《环境噪声指令》（2002/49/EC 指令）的要求。