Strategic noise map type A according to the Ln indicator (night) of the network in Loire-Atlantique
Description
Type “a” map delimiting, by isophone level in step of 5 dB(A), the areas exposed to noise in Ln, noise indicator during the night period, from 50 dB(A) to 70 dB(A) — Ferrated network — Order of 11/12/2018
Noise zones are geometric elements of the strategic noise map.
For type A maps (CBSTYPE), each noise zone is usually bounded by 2 isophone curves (Lden 55-60, 60-65, 65-70, 70-75 and Ln 50-55, 55-60, 60-65, 65-70) or shares the lower limit isophone curve (Lden >75, Ln > 70).
For type C maps (CBSTYPE), each noise zone shall be bounded by the lower limit isophone curve (Lden > 68 or 73, Ln > 62 or 65).
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Tags
- données-ouvertes
- train
- directive-2002-49-ce
- zone-de-bruit