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Areas exposed to road traffic noise at night (Ln) for Helensburgh Boulevard in Thouars, France, represented by isophone curves in 5 dB(A) steps from 50 dB(A). The data is produced by the Bureau de Recherches Géologiques et Minières (BRGM) to comply with the European Directive on Strategic Noise Maps, last updated in April 2019. The Ln indicator isolates the night period (22h-6h) and is associated with the risk of sleep disruption.
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