Strategic noise map — 2011 — important and complementary roads — Lden — contours

Strategic road noise map with more than 3 million vehicle passages per year according to RL 2002/49/EC, together with impact of additional roads. The reference year of these dates is 2011. The sound card shall indicate how much noise the environment is exposed to. The noise shall be expressed in the parameter Lden. The Lden level is a weighted annual average sound pressure level over the day where evening and night levels weigh relatively more heavily, which is consistent with the finding that noise is generally perceived as more nuisance in the evening and at night. European research shows that a Lden is a relatively good predictor of the extent to which residents may be affected.These noise maps are updated every 5 years.