The Highways Agency implements the Government's noise policy of mitigating the effects of noise, where practicable, arising from traffic on the Strategic Road Network (SRN). Quieter surfaces have been one of the key measures used by the Agency in order to manage and reduce noise impacts where possible. However, very little is known about the long term acoustic performance of these surfaces, which is essential when considering the sustainability of this type of mitigation. This work focuses on this need through the collection and analysis of appropriate long term data.
As well as providing information on which to form appropriate long term surfacing corrections to be used in noise assessments, the data are designed to assist the Agency’s response to the Environmental Noise Directive. In addition the feasibility and practicality of using the principles of the acoustic classification system, defined as part of the European SILVIA programme, on the SRN have been investigated.
The acoustic performance of low noise surfaces (together with a Hot Rolled Asphalt and an Exposed Aggregate Concrete surface) have been assessed over a three year measurement programme through the collection of data from Statistical Pass-By, Close Proximity and traffic noise surveys. These data have been analysed in conjunction with historical data to provide recommendations on the classification and performance of low noise surfaces over time.

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