 In this trait SS4 has a single, albeit reasonably wide carriageway, which was constructed in the 1960s in place of an earlier, less smooth road.For this reason, Italian Government plans to make SS4 a dual carriageway road between Rieti and Passo Corese, but around 1.5 billion euros are needed and it is not known when funds will be granted.Uprating of the trait from Cittaducale to Posta, where the carriageway is rather narrow and the road climbs up the Apennine mountains, is also planned to make the carriageway wider and less winding - even if the road will remain with a single carriageway.