Type A Lden : Zones exposées au bruit à plus de 55 dB(A)
Les zones de bruit sont des éléments géométriques constitutifs de la carte de bruit stratégique.
Pour les cartes de type A (CBSTYPE), chaque zone de bruit est généralement délimitée par 2 courbes isophones (Lden 55-60, 60-65, 65-70, 70-75 et Ln 50-55, 55-60, 60-65, 65-70) ou part la courbe isophone de limite inférieure (Lden sup 75, Ln sup 70).
Pour les cartes de type C (CBSTYPE), chaque zone de bruit est délimitée par la courbe isophone de limite inférieure (Lden sup 68 ou 73, Ln sup 62 ou 65).
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