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Great Britain road numbering scheme

From Simple English Wikipedia, the free encyclopedia
The numbering zones for A & B roads in Great Britain

In Great Britain, roads are given a letter with 1–4 numbers after it. This is how they are named. The letter is the category of the road. There are two main types of categories: motorways (with the letter M) and non-motorways. There are two types of non-motorways: A roads (with the letter A) and B roads (with the letter B). A roads are more important than B roads. There are also a very small number of C roads.

This system only applies to the island of Great Britain. Northern Ireland and other islands have their own systems.

Motorways (M roads)

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Single-digit A roads

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In England and Wales, the six A roads with one number are most important roads coming out of London. Starting with the A1 which goes north, numbers go clockwise around London:[1]

  • A1London to Edinburgh (also known as the Great North Road)
  • A2 – London to Dover (the southern part of Watling Street, also known as the Dover Road; though the A2 past Rochester has been replaced by the M2)
  • A3 – London to Portsmouth (also known as the Portsmouth Road)
  • A4 – London to Avonmouth (also known as the Great West Road or the Bath Road; though this route is not used anymore to travel far since the M4 was built)
  • A5 – London to Holyhead (the Northern part of Watling Street)
  • A6Luton to Carlisle (the A6 first started in Barnet on the old A1)

In Scotland, important roads from Edinburgh have A roads with one number:

Other A roads

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C road sign in Ribblesdale, North Yorkshire. There are not many C roads.


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  1. "Road Numbering". The Vauxhall Motorist. Vauxhall Motors. January 1935. Archived from the original on 2008-07-20. Retrieved 2007-12-29.