Construction

The motorway was built in stages starting in 1956. It began with the Savona – Ceva stretch being inaugurated on 27 January 1960. Work began shortly after in 1961 on the Ceva – Fossano stretch, including a connection to the city of Fossano and to the SS 28 for Turin. In May 1970, the Moncalieri – La Rotta section opened, followed by the Marene – Fossano stretch in July of the same year. Finally, in 1972, the initial Turin – Moncalieri – La Rotta section was built, with a separate roadway to Carmagnola.

The Fiat track

In 1972, a second roadway was put into operation in direction to Savona. This roadway was located in the stretch between Carmagnola and the Rio Coloré West service area. This roadway was used exclusively by FIAT as a test track for higher speeds. The track began three kilometers (approximately 1.86 miles) from the Carmagnola junction, with the terminal square being just before the service area. There is also a square that was used as a technical track at overpass number 33, just 25.400 km in. Claudio Maglioli was known to have used the track to try and bring a Lancia LC2 to the record speed of 387 km/h in preparation for the Le Mans race.

Dangers and safety concerns

The single roadway of the highway was considered very dangerous from marker 13 to 110 km, as the middle lane was used regularly for passing by both directions. Head-on collisions were common, with 91 incidents and three deaths in 1971 alone. For this, the highway was dubbed the "highway of death". At one point in 1980, the number of fatal accidents was so high, judicial authorities ordered the closure of the highway in the Ceva – Altare section towards Savona. This was ordered on 17 July 1980; not long after, on 1 October that year, the highway was reopened. The central passing lane was removed, and the speed limit was lowered to 70 km/h.

Doubling

In 1973, the doubling of Savona – Altare began, with the inauguration being in 1976. Later on in 1989, plans to double the stretch from Priero to Altare began. Work began in December 1993 and ended in July 1995. Four exits ceased use: Moncalieri "La Rotta" at the 3 km marker, the Vicoforte sanctuary at 67 km, Montezemolo at 92 km, and Carcare.

Sections of the plain were affected by works starting from Carmagnola using the sediment from the FIAT track. This began in 1991 and ended in 2001, which was also the end of the entire doubling plan.

Electronic speed control

In two sections of each roadway, the average speed is monitored by the Tutor system, implemented between the Carmagnola and Marene stations (both roadways), near Priero (north roadway only), and Quiliano (south roadway only). The effectiveness of the system in the Carmagnola – Marene section is considered limited due to the presence of the Rio Coloré Service Area in the section.

Route table

Torino – Savona La Verdemare
Type	Exit	km[1]	Area	European Route
	Tangenziale Sud di Torino Torino – C.so Unità d'Italia	0	TO
	La Rotta Villastellone Ceased use	2.9
	"Rio dei Cocchi" Service Area	10.8
	Torino Sud Barrier	13.0
	Carmagnola Poirino	13.1
	"Rio Coloré" Service Area	29.8
	Marene Asti Cherasco	34.6	CN
	"Rio Ghidone" Service Area	47.8
	Fossano – Fossano Junction	49.3
	Cuneo	54.0
	Carrù Dogliani	57.8
	Area Servizio "Mondovì est" North lanes only	61.6
	Mondovì	62.7
	Area Servizio "Mondovì ovest" South lanes only	63.0
	Santuario di Vicoforte Ceased use after highway doubled	67.1
	Niella Tanaro Santuario di Vicoforte	70.6
	Ceva del Colle di Nava – Imperia	81.0
	"Priero" Service Area	84.3
	Montezemolo Exit only in direction of Torino Ceased use after highway doubled	92.3
	Millesimo	97.1	SV
	"Cà Lidora Ovest" Service Area South lanes only	103.3
	"Carcare Est" Service Area North lanes only	107.6
	Altare – Carcare Cairo Montenotte	109.6
	Genova – Ventimiglia	124.3

The bridge of the junction on the Stura di Demonte