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The Autovía A-6 or Autopista AP-6 (also called Autovía del Noroeste) (Galician: Autovía do Noroeste) is a Spanish autovía and autopista route that starts in Madrid and ends in Arteixo (A Coruña).
The tolled Autopista AP-6, from Villalba to Adanero, has a total length of 72.19 km. It includes one of the most important engineering works in the whole motorway, a tri-tube tunnel under the Sierra de Guadarrama.
