Roads in Northern Ireland

[5] Work on the motorways continued until the 1970s when the oil crisis and The Troubles both intervened causing the abandonment of many schemes.

[6] The M3 was the final motorway scheme in Northern Ireland and the United Kingdom in its entirety to open.

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

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

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