Noise exposure of departmental and municipal roads for the period Lden 68 (overtaking value at 68 decibels)

Database defining the isophone of land transport infrastructure exceeding value (68 dB) over the period Lden. (Article R 572-5 of the Environmental Code).本数据库用于界定基于昼间-傍晚-夜间等效声级（Lden）评价周期的、陆路交通基础设施噪声超标（68分贝）对应的等声级线，相关定义符合《环境法典》第R 572-5条的规定。