Defra has appointed Hepworth Acoustics for a project that will help noise assessment professionals more accurately calculate the environmental impact of railway noise. The assignment is to re-examine and assess the impact on accuracy of predictions of the data and methodologies laid out in the WG-AEN's Good Practice Guide for Strategic Noise Mapping, version 2 of which was published in January 2006. The result will be recommendations that quantify the impact on accuracy of assumptions made when producing noise maps for railway noise. These recommendations could be used in a future version of the guide. The work for the European Union Working Group is being funded by Defra.
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