 Here SS4 becomes similar to a mountain road, since bends become more tight and the ascent more steep; but halfway through the canyon, a recently uprated stretch of the road begins, where tunnels and viaducts make the road smoother albeit still with a single carriageway.In Posta, at 700 metres above sea level, SS4 leaves the canyon and keeps going up in a broader plateau.Shortly after Cittareale the highway reaches its upper point, the Torrita Pass, at around 1010 metres on the sea level.