The Strada statale 131 (SS 131), is the major road in Sardinia, Italy. It is a freeway that connects the towns of Porto Torres and Cagliari via Sassari, Macomer and Oristano. At 229 km, it is considered the "spinal cord" of Sardinia.
It is a part of the E25 European route.

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Quick Facts State Highway 131, Route information ...

State Highway 131
Strada statale 131
Route information
Maintained by ANAS
Length	229.232 km (142.438 mi)
Existed	May 17, 1928–present
Major junctions
From	Porto Torres
Major intersections	Strada statale 131 Diramazione Centrale Nuorese
To	Cagliari
Location
Country	Italy
Major cities	Porto Torres, Sassari, Macomer, Oristano, Cagliari
Highway system
Roads in Italy Autostrade State Regional Provincial Municipal

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Building works begun in the 19th century, under the Kingdom of Charles Felix of Sardinia, the road followed the route of the ancient Roman road Turris Lybissonis-Caralis.

The infrastructure was modernized under fascism, and in the 1970s was rebuilt, becoming a Superstrada (Dual carriageway), some stretches are classified a second category extra-urban road, and the speed limit is 90 km/h, while other ones are considered first category extra-urban road with higher speed limits (110 km/h).

• SS 131 Carlo Felice in Serrenti
• SS 131 Carlo Felice in Sassari

• Strada statale 131 Diramazione Centrale Nuorese

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