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<p>It is well understood that trees and vegetation have a limited effect on noise
propagation from roads, and a broad band of densely planted trees is required to significantly
reduce noise.</p><p> </p><p>The EC’s 'HOSANNA' research project (Holistic and Sustainable
Abatement of Noise by Optimised Combinations of Natural and Artificial Means) has
identified and assessed vegetation strategies that could deliver perceptible noise
reductions. The project’s findings became available between 2010 and 2013.</p><p>
</p><p>The Highways Agency will consider these strategies for use on new or modified
road schemes.</p>
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