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Double Roads (Motorways)
 Motorways are one of the element that disturb more the environment, they are very busy areas with a high level of noise. As you can see in the image, this kind of roads are very wide, therefore, they are more visible than single roads and it is more difficult to hide them behind vegetation, terrain...
Another factor related with roads is their visibility, as it happens with other kind of structures. Therefore, the visibility map was calculated and the raster image in the map below shows from which areas it is possible to see the motorways and from where it is not possible. Moreover, a buffer of 3km wide represents the noise influence of motorways
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