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A-1604
| 
Vertigo road between the junction of the N330 and Boltaña, a small town in the Spanish province of Huesca, near the Pyrinees.
Breath taking views, with huge precipices (over 1.000m), deep gullies and wild animals. Without a marked central line, the road is extremely narrow and the absence of guard rails makes it really dangerous, specially during rainy or snowy days. 
The road is 49km long, and has more than 1.000 turns. Several of them are hairpins and the expected time to drive the road its around 60 minutes. 
The road has an absence of traffic (usually) and includes the climb to the Puerto del Serrablo, a high mountain pass with an elevation of 1.291m above the sea level (1st category). The road has been climbed several times on the Vuelta a España race.