Abstract
The inverse relation of the uncertainty of the equivalent sound pressure
level to the square root of the number of vehicle pass-bys is investigated.
The influence of the traffic spatial distribution is evaluated by
means of a computer model, based on Monte Carlo and the Weyl–Ingard
Theory. The model results are discussed and compared with experimental
data. By least mean squares fitting of simulated results, a new expression
is obtained for the sound pressure level uncertainty, that takes
into account the receiver position, road configuration and traffic
flow balance. This expression explains the different values found
in the literature and yields uncertainty values that may not be covered
by the ISO 1996-2:2007 recommendation, in some specific circumstances.
Finally the path for building traffic noise uncertainty maps is sketched
out.
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