Collado de Errozate road is not recommended to newbies
Collado de Errozate (Col d'Errozaté) is an international mountain pass at an elevation of 1.076m (3,530ft) above the sea level, located on the Spanish-French border.
The pass sits in the Pyrenees, a mountain range on the border between France and Spain. The road to the summit is difficult. It’s paved (very bad conditions) and extremely narrow. If you're afraid of heights, it's probably best to keep your eyes forward. Not recommended if you don't know how to reverse.
Along the way you’ll feel on a lunar landscape. The road is hairpinned and pretty steep, with some parts up to 16.5%. Not recommended to newbies. Starting from D301 road, the ascent is 3.4km long. The road tops out at 1.281m (4,202ft) above the sea level.