Abstract
Legislation limiting the noise emission of new and/or in-service vehicles has the obvious aim of reducing community annoyance caused by traffic noise, but the effectiveness of such legislation must be questioned. Firstly, the rank ordering of the noise levels emitted by different vehicles changes according to the particular vehicle operating mode specified for the test, yet most current legislation specifies only one operating mode which is itself of limited relevance to urban or highway traffic conditions. Secondly, there is still a wide discrepancy between the predicted lower traffic noise levels which should result from quieter vehicles and acceptable community noise levels. Thus, for the effective protection of a community against traffic noise, legislation should be extended to include at least the following: (a) the measurement of a vehicle's noise emission in several operating modes, (b) the restriction of vehicle movements with respect to routes and times, and (c) the provision of compensation to owners of adversely affected buildings so that the attenuation provided by their external envelopes may be improved.
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