The A-23 runs through the corridors of the N-234, between Sagunto and Retascón and the N-330 between Retascón and Jaca. The road is new and independent of national roads with two exceptions, one being 10 km from Viver (Ragudo rise), and the other between Nueno and Monrepós, about 75 km south of Somport using parts of the N-330 to cross the difficult terrain of the Pre-Pyrenees mountains. This was the most expensive portion of the highway to build.