The General Directorate of roads has made 20 studies that include all major roads of its reponsability (5,000 km approximately). Each study (except first) includes several major roads, generally, a complete Province or a "Comunidad Autónoma" (region), or 0one or several traffic corridors.
The following information is available for the public, and it can be consulted and downloaded from this web site.
Action plan against noise map (2008-2012)
Summary (pdf file )
Anejo I: datos suministrados a la Comisión Europea (zip file ) (in Spanish)
Anejo II: resultados por Demarcaciones de Carreteras del Estado (pdf file )(in Spanish)
Anejo III: Datos de población expuesta (pdf file ) (in Spanish)