A4 (Italy)
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The Autostrada A4, or Autostrada Serenissima ("
Serenissima aSerenissima ( heMost Serene) may refer to: Certain countries * , a name for the Republic of Venice * , the official Latin name of the Polish–Lithuanian Commonwealth Art, entertainment, and media * La Serenissima (musical ensemble), a Britis ...
motorway"), is an ''
autostrada The ''autostrade'' (; : ''autostrada'', ) are roads forming the Italian national system of motorways. The total length of the system is about , as of 30 July 2022. There are also 13 motorway spur routes, which extend for . Most of the Itali ...
'' (
Italian Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, a Romance ethnic group related to or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance languag ...
for "
motorway A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms ...
") long in
Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
located in the
regions In geography, regions, otherwise referred to as areas, zones, lands or territories, are portions of the Earth's surface that are broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and ...
of
Piedmont Piedmont ( ; ; ) is one of the 20 regions of Italy, located in the northwest Italy, Northwest of the country. It borders the Liguria region to the south, the Lombardy and Emilia-Romagna regions to the east, and the Aosta Valley region to the ...
,
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
,
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
and
Friuli-Venezia Giulia Friuli-Venezia Giulia () is one of the 20 regions of Italy and one of five autonomous regions with special statute. The regional capital is Trieste on the Gulf of Trieste, a bay of the Adriatic Sea. Friuli-Venezia Giulia has an area of and a ...
which connects
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
and
Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...
via
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
and
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
crossing the entire
Po Valley The Po Valley, Po Plain, Plain of the Po, or Padan Plain (, , or ) is a major geographical feature of northern Italy. It extends approximately in an east-west direction, with an area of including its Venetian Plain, Venetic extension not actu ...
from west to east. The city of Venice (or rather,
Mestre Mestre () is a borough of the comune of Venice on the mainland opposite the historical island city in the region of Veneto, Italy. Administratively, Mestre forms (together with the nearby Carpenedo) the Municipalità di Mestre-Carpenedo, one ...
, a mainland ''
frazione A ''frazione'' (: ''frazioni'') is a type of subdivision of a ''comune'' ('municipality') in Italy, often a small village or hamlet outside the main town. Most ''frazioni'' were created during the Fascist era (1922–1943) as a way to consolidat ...
'' of Venice) originally formed a bottleneck on the A4, but is now bypassed by the Passante di Mestre (the old route through Mestre was renumbered A57). The A4 passes just north of the city of Milan, where it is toll-free. It is a part of the E55, E64 and E70 European routes.


Overview

Due to the different companies that manage the different parts of the motorway, it is often referred to as formed by five sections:
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
-
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
,
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
-
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
,
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
-
Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...
,
Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...
-
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
and
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
-
Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...
. As it runs through the whole
Pianura Padana The Po Valley, Po Plain, Plain of the Po, or Padan Plain (, , or ) is a major geographical feature of northern Italy. It extends approximately in an east-west direction, with an area of including its Venetic extension not actually related to ...
, which is a densely populated and highly industrialized area, A4 is one of the most trafficked motorways of Italy. Before World War II, three sections of the motorway were built: Turin-Milan, Milan-Brescia and Padua-Venice. The first section built was Milan-Bergamo, which opened on 24 September 1927, being just the second motorway to open, following the Autostrada dei Laghi in 1924/25. On 29 August 1931, it was extended to Brescia. On 25 October 1932, the Turin-Milan section opened, and on 15 October 1933, the Padua-Venice section. The two sections became connected on 10 February 1962, when the Brescia-Padua section opened. The Venice-Trieste section was opened on 22 February 1970. The original road through Mestre, now designated A57 and named "Tangenziale di Mestre", opened on 3 September 1972. A4 is a dual-carriageway, six-lane motorway for most of its length. The stretch between
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
o Est
tollgate A tollbooth (or toll booth) is an enclosure placed along a toll road that is used for the purpose of collecting a Toll (fee), toll from passing traffic. A structure consisting of several tollbooths placed next to each other is called a toll p ...
and
Bergamo Bergamo ( , ; ) is a city in the Alps, alpine Lombardy region of northern Italy, approximately northeast of Milan, and about from the alpine lakes Lake Como, Como and Lake Iseo, Iseo and 70 km (43 mi) from Lake Garda, Garda and Lake ...
has been an eight-lane motorway since 30 September 2007. The stretch from
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
to
Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...
is instead still a four-lane motorway, but it is planned to upgrade this stretch over motorway to six lanes.


Operators

*
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
-
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
: SATAP *
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
-
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
:
Autostrade per l'Italia Autostrade per l'Italia S.p.A. (formerly Autostrade S.p.A.) is an Italian joint-stock company specializing in the management of motorway sections under concession and related maintenance activities. Originally established as a state-owned enter ...
(a subsidiary of Atlantia) *
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
-
Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...
:
A4 Holding A4 Holding S.p.A. known as Gruppo A4 Holding (previously as Serenissima Group), is an Italian holding company based in Verona, Veneto region. The company owned ''Autostrada Brescia Verona Vicenza Padova'' (100%), the operator of Brescia–Padua se ...
(a subsidiary of
Abertis Abertis Infraestructuras, S.A. () is a Spanish worldwide corporation engaged in toll road management. The company is headquartered in Madrid. The company runs over 8,600 kilometres of toll roads in the world. In October 2018, it was acquired by I ...
) *
Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...
-
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
: Concessioni Autostradali Venete (since 2009;
ANAS ''Anas'' is a genus of dabbling ducks. It includes the pintails, most teals, and the mallard and its close relatives. It formerly included additional species but following the publication of a molecular phylogenetic study in 2009 the genus was s ...
and Veneto Region joint venture) *
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
-
Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...
: Autovie Venete


Passante di Mestre

The passante di Mestre is a part of the A4 motorway, opened to traffic on 8 February 2009. The objective of the route is to reduce the volume of auto- and truck-based traffic passing through Mestre (a mainland ''
frazione A ''frazione'' (: ''frazioni'') is a type of subdivision of a ''comune'' ('municipality') in Italy, often a small village or hamlet outside the main town. Most ''frazioni'' were created during the Fascist era (1922–1943) as a way to consolidat ...
'' of Venice) to reach non-local destinations like
Austria Austria, formally the Republic of Austria, is a landlocked country in Central Europe, lying in the Eastern Alps. It is a federation of nine Federal states of Austria, states, of which the capital Vienna is the List of largest cities in Aust ...
,
Slovenia Slovenia, officially the Republic of Slovenia, is a country in Central Europe. It borders Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the south and southeast, and a short (46.6 km) coastline within the Adriati ...
and other Eastern European countries. The new includes three lanes plus one emergency lane. Each lane measures apart from the emergency lane which measures only , and the new stretch of motorway totals .


Major cities

Autostrada A4 Passes through
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
,
Settimo Torinese Settimo Torinese () is a ''comune'' in the Metropolitan City of Turin, in Piedmont, Italy. The name ''settimo'' means "seventh", and it comes from the comune's distance from Turin, which is seven Roman miles. It is bordered by the other comuni of ...
,
Novara Novara (; Novarese Lombard, Novarese: ) is the capital city of the province of Novara in the Piedmont (Italy), Piedmont region in northwest Italy, to the west of Milan. With 101,916 inhabitants (on 1 January 2021), it is the second most populous ...
,
Cusano Milanino Cusano Milanino (local ) is a town and ''comune'' in the Metropolitan City of Milan, in Lombardy. Cusano Milanino is about 13 kilometers far from the centre of Milan. It borders Paderno Dugnano, Cinisello Balsamo, Cormano, and Bresso. People ...
,
Cinisello Balsamo Cinisello Balsamo (; ) is a ''comune'' (municipality) of about 75,200 inhabitants in the Metropolitan City of Milan, in the Italian region of Lombardy, about northeast of Milan city center. Cinisello Balsamo borders the following municipalitie ...
,
Monza Monza (, ; ; , locally ; ) is a city and ''comune'' (municipality) on the Lambro, River Lambro, a tributary of the Po (river), River Po, in the Lombardy region of Italy, about north-northeast of Milan. It is the capital of the province of Mo ...
,
Bergamo Bergamo ( , ; ) is a city in the Alps, alpine Lombardy region of northern Italy, approximately northeast of Milan, and about from the alpine lakes Lake Como, Como and Lake Iseo, Iseo and 70 km (43 mi) from Lake Garda, Garda and Lake ...
,
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
,
Verona Verona ( ; ; or ) is a city on the Adige, River Adige in Veneto, Italy, with 255,131 inhabitants. It is one of the seven provincial capitals of the region, and is the largest city Comune, municipality in the region and in Northeast Italy, nor ...
,
Vicenza Vicenza ( , ; or , archaically ) is a city in northeastern Italy. It is in the Veneto region, at the northern base of the Monte Berico, where it straddles the Bacchiglione, River Bacchiglione. Vicenza is approximately west of Venice and e ...
, and
Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...
.


Route


A4/A5 Ivrea-Santhià connection


A4/A26 Stroppiana-Santhià connection


Chivasso connection


Latisana connection


See also

*
Autostrade of Italy The ''autostrade'' (; : ''autostrada'', ) are roads forming the Italian national system of motorways. The total length of the system is about , as of 30 July 2022. There are also 13 motorway spur routes, which extend for . Most of the Ital ...
*
Roads in Italy Roads in Italy are an important mode of transport in Italy. The classification of the roads of Italy is regulated by the Italian traffic code, both from a technical and administrative point of view. The street nomenclature largely reflects the ...
*
Transport in Italy Italy has a well developed transport infrastructure. The Italian rail network is extensive (), especially in the north, and it includes a high-speed rail network that joins the major cities of Italy from Naples through northern cities such a ...


Other Italian roads

*
State highways (Italy) The Strade Statali (; ), abbreviated SS, are the Italian national network of state highways. The total length of the network is about . The Italian state highway network is maintained by ANAS. From 1928 until 1946, state highways were maintain ...
*
Regional road (Italy) A strada regionale (Italian language, Italian for regional road; "strade regionali"), abbreviated SR, is a type of Roads in Italy, Italian road maintained by the regions of Italy, regions they traverse. In the administrative hierarchy, a regiona ...
*
Provincial road (Italy) A strada provinciale (Italian for provincial road; "strade provinciali"), abbreviated SP, is an Italian road that is maintained by provinces or metropolitan cities. In Veneto from 2002, state highways downgraded as provincial roads are maintain ...
*
Municipal road (Italy) A strada comunale (Italian for municipal road; "strade comunali"), abbreviated SC, is an Italian road that is maintained by ''comune'', hence the name. They can be roads owned by ''comune'' (inside population centers) or roads managed by the '' ...


Notes


References


External links


Autostrade per l'Italia website
last accessed on 1 November 2008
Autostrada Brescia-PadovaAutostrada Padova-VeneziaAutovie Venete

Official website of the passante di Mestre
{{Autostrade A04 Transport infrastructure completed in 1927 1927 establishments in Italy Transport in Piedmont Transport in Lombardy Transport in Veneto Transport in Friuli-Venezia Giulia