Great Britain road numbering scheme
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)[change | change source]
A roads[change | change source]
Single-digit A roads[change | change source]
- 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to Dover, (The southern part of Watling Street, also known as the Dover Road), however, the A2 past Rochester has been replaced by the M2.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), although 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, although the M74 and M8 motorways now are mainly used.
- A8 Edinburgh to Greenock, which used to link Edinburgh to Glasgow, however 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[change | change source]
- 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[change | change source]
- 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