Because
road traffic noise is a random phenomenon, the relevant legislation and
standards often require the determination of the acoustic descriptors either on
a medium or long term.
For instance, the day-evening-night level Lden introduced by the European Directive 2002/49/EC (2002), even if referred to 24h, should be representative of the annual period, and, in Italy, the current
legislation requires that the road traffic noise monitoring lasts at least one
week. The current instrumentation enables measurements over a long time, as it
can store and transmit a large amount of data. However, such duration is not
feasible for monitoring attended by an operator and, therefore, requires the
time-consuming post processing validation of the acquired data to eliminate all
of the sound events that are not associated with road traffic noise. Read more>>>>>>>>>>>
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