Abstract
In 1974 a study was carried out in ten French towns comprising noise
measurement and a psycho-sociological survey of 1000 respondents
in order to estimate the annoyance cause to people living close to
expressways. The main object of the research was to establish, for
legislative and regulatory purposes, a suitable noise index, together
with a noise level acceptable to residents adjacent to major traffic
routes, to relate the annoyance to the major activities disturbed
by noise, and to the socio-demographic characteristics of the population
studied.
Annoyance was shown to be related to measured noise levels. For the
period 08.00–20.00 hours the equivalent noise level (Leq) is proposed
as a suitable unit and it is suggested that noise levels should not
exceed 65 dB(A). Heavy lorries were found to constitute major sources
of annoyance, particularly during the evening. To deal with this
problem, L1 for the period 20.00–24.00 hours is proposed as a suitable
measure, with levels not permitted to exceed 70 dB(A). For residents
in bungalows, levels need tobe somewhat lower.
In two of the towns studied, a second survey was carried out after
an interval of two years. It was found that the level of annoyance
had not declined during this period and it is concluded that no habituation
to noise had taken place.
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