The main roads in Northern Ireland are signed "M"/"A"/"B" as in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It i ...

. Whereas the roads in Great Britain are numbered according to a zonal system, there is no available explanation for the allocation of road numbers in Northern Ireland, though their numbering is separate from the system in

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

Scotland Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...

and

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

. In

Northern Ireland Northern Ireland ( ga, Tuaisceart Éireann ; sco, label= Ulster-Scots, Norlin Airlann) is a part of the United Kingdom, situated in the north-east of the island of Ireland, that is variously described as a country, province or region. Nort ...

DfI Roads Department for Infrastructure Roads or DfI Roads (formerly Transport NI, and the Roads Service) is the public body responsible for the upkeep and maintenance of highways and roads in Northern Ireland in the United Kingdom. It is an executive ...

is responsible for all of roads. Road users also have the

Highway Code for Northern Ireland ''The Highway Code'' is a set of information, advice, guides and mandatory rules for road users in the United Kingdom. Its objective is to promote road safety. The ''Highway Code'' applies to all road users including pedestrians, horse riders ...

, which provide guidance on the legal aspects of driving on Northern Ireland's roads.

Motorways

The most important roads are motorways, designated by the letter "M". The motorway network is focused on

Belfast Belfast ( , ; from ga, Béal Feirste , meaning 'mouth of the sand-bank ford') is the capital and largest city of Northern Ireland, standing on the banks of the River Lagan on the east coast. It is the 12th-largest city in the United Kingdom ...

. Legal authority for motorways existed in the Special Roads Act of 1963 similar to that in the Special Roads Act 1949 in Great Britain. The first motorway to open was the

M1 motorway The M1 motorway connects London to Leeds, where it joins the A1(M) near Aberford, to connect to Newcastle. It was the first inter-urban motorway to be completed in the UK; the first motorway in the country was the Preston By-pass, which ...

, though it did so under temporary powers until the Special Roads Act had been passed. Work on the motorways continued until the 1970s when the oil crisis and

The Troubles The Troubles ( ga, Na Trioblóidí) were an ethno-nationalist conflict in Northern Ireland that lasted about 30 years from the late 1960s to 1998. Also known internationally as the Northern Ireland conflict, it is sometimes described as an " ...

both intervened causing the abandonment of many schemes. The M3 was the final motorway scheme in Northern Ireland and the United Kingdom in its entirety to open.

"A" roads

The next most important roads are designated with the prefix "A" and a one-, two- or three-digit number.

"B" roads

Less important roads are indicated with the prefix "B" and a one-, two- or three- digit number.

"C" roads

Minor roads can be indicated with the prefix "C" and a one-, two- or three- digit number, though it is very rare to see these marked on signposts or Ordnance Survey maps

Euro Routes

Though unsignposted, the following Euro Routes include sections of roads in Northern Ireland: *E01 –

Larne Larne (, , the name of a Gaelic territory) is a town on the east coast of County Antrim, Northern Ireland, with a population of 18,755 at the 2011 Census. It is a major passenger and freight roll-on roll-off port. Larne is administered by Mid ...

–

Dublin Dublin (; , or ) is the capital and largest city of Ireland. On a bay at the mouth of the River Liffey, it is in the province of Leinster, bordered on the south by the Dublin Mountains, a part of the Wicklow Mountains range. At the 2016 c ...

– Rosslare –

A Coruña A Coruña (; es, La Coruña ; historical English: Corunna or The Groyne) is a city and municipality of Galicia, Spain. A Coruña is the most populated city in Galicia and the second most populated municipality in the autonomous community and s ...

–

Pontevedra Pontevedra (, ) is a Spanish city in the north-west of the Iberian Peninsula. It is the capital of both the '' Comarca'' (County) and Province of Pontevedra, and of the Rías Baixas in Galicia. It is also the capital of its own municipality wh ...

– Valença do Minho –

Vila Real de Santo António Vila Real de Santo António (, often run together as ) is a city, civil parish, and municipality in the Algarve, Portugal. The population in 2011 was 19,156, in an area of 61.25 km2. It is one of the few municipalities in Portugal without ter ...

–

Huelva Huelva (, ) is a city in southwestern Spain, the capital of the province of Huelva in the autonomous community of Andalusia. It is between two short rias though has an outlying spur including nature reserve on the Gulf of Cádiz coast. The ria ...

–

Sevilla Seville (; es, Sevilla, ) is the capital and largest city of the Spanish autonomous community of Andalusia and the province of Seville. It is situated on the lower reaches of the River Guadalquivir, in the southwest of the Iberian Peninsula ...

*E16 – Derry –

...

Glasgow Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popul ...

–

Edinburgh Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian on the southern shore of t ...

...

Bergen Bergen (), historically Bjørgvin, is a city and municipality in Vestland county on the west coast of Norway. , its population is roughly 285,900. Bergen is the second-largest city in Norway. The municipality covers and is on the peninsula o ...

– Arna –

Voss Voss () is a municipality and a traditional district in Vestland county, Norway. The administrative center of the municipality is the village of Vossevangen. Other villages include Bolstadøyri, Borstrondi, Evanger, Kvitheim, Mjølfjell, ...

...

Lærdal Lærdal is a municipality in Vestland county, Norway. It is located on the south side of the Sognefjorden in the traditional district of Sogn. The administrative center of the municipality is the village of Lærdalsøyri. The old Filefjell Kon ...

–

Tyin Tyin is a lake in Vang Municipality in Innlandet county, Norway. The lake is located in the southwest part of the Jotunheimen mountain range. The lake lies in Vang Municipality in Innlandet county, but a small portion of the lake extends into Å ...

–

Fagernes is a town in Nord-Aurdal Municipality in Innlandet county, Norway. The town is the administrative centre of the municipality as well as the largest urban/commercial centre for the Valdres region. It is located just northwest of the village of ...

–

Hønefoss __NOTOC__ Hønefoss is a town and the administrative center of the municipality of Ringerike in Buskerud county, Norway. Hønefoss is an industrial center of inner Østlandet, containing several factories and other industry. As of 1 January 2008 ...

– Sandvika –

Oslo Oslo ( , , or ; sma, Oslove) is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of in 2022, while the city's greater urban area had a population ...

* E18 – Craigavon –

–

... Stranraer – Gretna – Carlisle –

Newcastle Newcastle usually refers to: *Newcastle upon Tyne, a city and metropolitan borough in Tyne and Wear, England *Newcastle-under-Lyme, a town in Staffordshire, England *Newcastle, New South Wales, a metropolitan area in Australia, named after Newcastle ...

...

Kristiansand Kristiansand is a seaside resort city and municipality in Agder county, Norway. The city is the fifth-largest and the municipality the sixth-largest in Norway, with a population of around 112,000 as of January 2020, following the incorporati ...

– Arendal –

Porsgrunn is a city and municipality in Telemark in the county of Vestfold og Telemark in Norway. It is part of the traditional region of Grenland. The administrative centre of the municipality is the city of Porsgrunn. The municipality of Porsgrunn w ...

– Larvik –

Sandefjord Sandefjord () is a city and the most populous municipality in Vestfold og Telemark county, Norway. The municipality of Sandefjord was established on 1 January 1838. The municipality of Sandar was merged into Sandefjord on 1 January 1969. On 1 ...

– Horten –

Drammen Drammen () is a city and municipality in Viken, Norway. The port and river city of Drammen is centrally located in the south-eastern and most populated part of Norway. Drammen municipality also includes smaller towns and villages such as Konne ...

–

Askim Askim () is a town and a former municipality in (from January 1, 2020) Indre Østfold Kommune in the former county of Østfold county (from January 1, 2020 a part of Viken county), Norway. The administrative centre of the Askim municipality wa ...

– Karlstad –

Örebro Örebro ( , ) is the sixth-largest city in Sweden, the seat of Örebro Municipality, and capital of the Örebro County. It is situated by the Närke Plain, near the lake Hjälmaren, a few kilometers inland along the small river Svartån, and ...

–

Västerås Västerås ( , , ) is a city in central Sweden on the shore of Lake Mälaren in the province of Västmanland, west of Stockholm. The city had a population of 127,799 at the end of 2019, out of the municipal total of 154,049. Västerås is the se ...

– Stockholm/

Kapellskär Kapellskär () is a port about north of Stockholm, in Sweden. It is located by the Baltic Sea, in Norrtälje Municipality, Stockholm County. Services The port is served by frequent passenger ferry services to Mariehamn, Åland, Finland, operated ...

... Mariehamn ...

Turku Turku ( ; ; sv, Åbo, ) is a city and former capital on the southwest coast of Finland at the mouth of the Aura River, in the region of Finland Proper (''Varsinais-Suomi'') and the former Turku and Pori Province (''Turun ja Porin lääni''; ...

Naantali Naantali (; sv, Nådendal) is a town in southwestern Finland, and, as a resort town during the summer, an important tourist centre of the country. The municipality has a population of (), and is located in the region of Southwest Finland, west ...

–

Helsinki Helsinki ( or ; ; sv, Helsingfors, ) is the capital, primate, and most populous city of Finland. Located on the shore of the Gulf of Finland, it is the seat of the region of Uusimaa in southern Finland, and has a population of . The city ...

–

Kotka Kotka (; ; la, Aquilopolis) is a city in the southern part of the Kymenlaakso province on the Gulf of Finland. Kotka is a major port and industrial city and also a diverse school and cultural city, which was formerly part of the old Kymi parish ...

– Vaalimaa –

Vyborg Vyborg (; rus, Вы́борг, links=1, r=Výborg, p=ˈvɨbərk; fi, Viipuri ; sv, Viborg ; german: Wiborg ) is a town in, and the administrative center of, Vyborgsky District in Leningrad Oblast, Russia. It lies on the Karelian Isthmus n ...

–

Saint Petersburg Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), i ...

References