title: Great Britain road numbering scheme
text: 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)
  
  A roads
  
  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to Dover, (The southern part of Watling Street, also known as the Dover Road), however, the A2 past Rochester has been replaced by the M2.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  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 
  
  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
  
  References 
  
  Roads in the United Kingdom