Gobierno de España. Ministerio de Fomento
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 one or several traffic corridors.
The following information is available for the public, and it can be consulted and downloaded from this web site.