recent research has indicated the possibility that with reduced power unit noise, tyre to road surface noise could become the predominant source of lorry noise. an investigation at the transport and road research laboratory has shown that, although tyre noise does not contribute and is unlikely to contribute significantly to levels measured in the british standard drive-by-test, tyre road surface noise will be the predominant source of noise from envisaged quieter heavy lorries when they are travelling at speeds approaching 100km/h on dry roads and at speeds over 50km/h on wet roads. the parameters that most markedly affect tyre noise are vehicle speed, tyre tread pattern, road surface texture and whether the surface is wet or dry. (a)

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