 Shortly before Cittaducale, the road returns a single carriageway and pretty narrow road, which still needs to be uprated and follows a similar path to the ancient Roman road.While slightly ascending, SS4 reaches the spa town of Cotilia and then Antrodoco, where it joins State Highway 17 to L'Aquila.In Antrodoco (470 metres on sea level) the road follows the river's valley, bending to the north and entering the narrow "Gole del Velino" canyon.