interesting part of a cut through from northern Spain towards the coast plenty of corners to keep you awake strangely when i did this section there was a few large lorries about (be warned)
This is what biking is all about. Straights at the start and finish, big twisty section in the middle through some unbelieveable scenery set into a couple of canyons and pretty little villages with cafes at good intervals. Not many big vehicles could make it down this road and I certainly didn't see any. Best to do it from north to south as I think the road surface is a little better.