 For this reason, SS4 had once a rather rough course from here on, with tight bends and continuous rises and descents; current SS4 is a completely new road (constructed in the 1960s to replace the old one from Passo Corese to Rieti), much more straight and wide, albeit still with a single carriageway.As the road passes the Sabine mountains, it reaches an altitude of 400 metres above sea level at Osteria Nuova and it descents into a narrow valley, then rises again until reaching 570 metres in the village of Ornaro, and finally descents.In Rieti SS4 turns sharply into East, quickly leaves the Rieti plain and prosecutes in the Velino valley.