Strada statale 4 dir

State Highway 4dir
Strada statale 4dir (Italian)
Route information
Maintained by ANAS
Length	4.5 km (2.8 mi)
Existed	1964–present
Major junctions
From	Strada statale 4 Via Salaria at Passo Corese
Major intersections	Autostrada A1 at Fiano Romano
To	Provincial road SP 15/A Tiberina at Fiano Romano
Location
Country	Italy
Regions	Lazio
Highway system
Roads in Italy Autostrade State Regional Provincial
← SS 4 → SS 5

Strada statale 4 Dir or SS 4 Dir or SS 4 Salaria Dir is a short Italian state highway, linking Strada statale 4 Via Salaria at Passo Corese to the A1 motorway at Fiano Romano.

It is a dual carriageway highway long only 4.5 kilometers (2.8 mi), made in 1964 and managed by ANAS. It is recognized as a road of national interest.

Route

Strada statale 4 Dir was built to make more fluid traffic between the province of Rieti and Rome, taking advantage to the fact that, in that area, Via Salaria and the A1 motorway are very close (3 kilometers (1.9 mi)) but divided by Tiber river.

In fact, SS 4 Dir allows to travel from Passo Corese to Rome entirely on fast-flowings roads, linking Via Salaria to the A1 motorway northbound branch (A1 Dir) which is connected to Grande Raccordo Anulare and, from this, to Tangenziale Est of Rome. The alternative would be to use the Strada statale 4 Via Salaria that is a single carriage highway, extending travel times and clogging up traffic.

Via Salaria
Type	Intersection	↓Distance↓	Province
	Via Salaria	0.0 km (0 mi)	Rieti
	Passo Corese logistics hub Fara in Sabina railroad station	0.8 km (0.50 mi)	Rome
	Tiber river	1.1 km (0.68 mi)
	Fiano Romano	2.8 km (1.7 mi)
	A1 northbound branch (Fiano Romano motorway exit) (only entry towards Passo Corese)	3.7 km (2.3 mi)
	A1 northbound branch (Fiano Romano motorway exit) (only exit towards Rome) Provincial road SP 15/A Tiberina- Fiano Romano A1 toolboth	4.5 km (2.8 mi)