Great Britain road numbering scheme

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)

Main page: List of motorways in the United Kingdom

Single-digit A roads

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:

• A1 – London 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– London to Dover (the southern part of Watling Street, also known as the Dover Road; though the A2 past Rochester has been replaced by the M2)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)
• A6 – Luton to Carlisle (the A6 first started in Barnet on the old A1)

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

• A7 – Edinburgh to Carlisle (though the M74 and M8 motorways now are mainly used)
• A8 – Edinburgh to Greenock (used to link Edinburgh to Glasgow, but it now ends and carries on as the M8 25 miles (40 km) away from Glasgow)
• A9 – Falkirk to Scrabster (first went from Edinburgh to Inverness)

Other A roads

• Zone 1 A roads
• Zone 2 A roads
• Zone 3 A roads
• Zone 4 A roads
• Zone 5 A roads
• Zone 6 A roads
• Zone 7 A roads
• Zone 8 A roads
• Zone 9 A roads

B roads

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

• Zone 1 B roads
• Zone 2 B roads
• Zone 3 B roads
• Zone 4 B roads
• Zone 5 B roads
• Zone 6 B roads
• Zone 7 B roads
• Zone 8 B roads
• Zone 9 B roads

Great Britain Road Numbering Scheme Media

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  This sign at Crouch Hill shows two road numbers in Zone 2.

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  Motorway number zones of England and Wales