Defra - Department for Environment, Food and Rural Affairs.

Science Search

Science and Research Projects

Return to Science Search homepage   Return to Search List

Comparison of the impact of using different input parameters between Round 1 and Round 2 noise mapping - NO0246

Legislation that has transposed the requirements of the EU Environmental Noise Directive (END) requires that, on a five-year cycle, Defra complete noise mapping and produce noise action plans for road, rail and industrial sources covered by the Directive and make information available to the public about the results. The first round of noise mapping was completed in 2007 and covered 23 agglomerations (as defined by the END and regulations). The definition of agglomeration was different for the second round such that 65 agglomerations had to be covered. The definition of ‘major’ sources also changed meaning more such roads and railways had to be mapped. Consequently the scope of the mapping increased hugely between Round 1 and Round 2. However, the available budget was about 20% of what had been spent on Round 1.

The END is silent on precisely which roads are mapped in agglomerations and so the Round 2 mapping was achieved within the smaller budget primarily by adopting a very different contract structure but also confining the scope of the agglomeration mapping. The approach met the legal requirements of the END and provided the data needed to enable the noise action planning to occur (i.e. focussing on those most affected). However, it did mean that we lost backward compatibility with the Round 1 results and lost the ability to obtain a consistent update of the monetised and health impacts of road traffic noise.

This project mapped 4 agglomerations from R2 (two larger; two smaller) using the Round 2 data (in terms of currency) but including the same sources as used in the agglomerations for Round 1. The results will assist us with an understanding of the effect of the different methodologies on the backward compatibility and provide a better basis for the estimating the changes in monetised and health impacts.
To compare the impact of having to use different input parameters in the noise mapping carried out for meeting our EU obligations between Round 1 and Round 2 to maximise backward capability and application of results.
Project Documents
• EVID4 - Final project report : NANR 326 Final   (562k)
Time-Scale and Cost
From: 2014

To: 2014

Cost: £79,800
Contractor / Funded Organisations
Hepworth Acoustics Ltd
Fields of Study