What does the M and A in British roads mean?

The basic idea is that most roads in England and Wales begin with numbers 1, 2, 3, 4, 5 and 6, with London as the hub, and most roads in Scotland begin with numbers 7, 8 and 9, with Edinburgh as the hub. There are three basic types of numbered road: motorways (beginning with an M), A-roads and B-roads.



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A(M): the other kind of motorway Only in the UK do we have a designation that's a hybrid of two other types, with a letter in brackets after the number. It is usually described as an A-road with motorway restrictions.

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A-roads are major roads between regional towns and cities; they can be called 'trunk' roads or 'principal' roads. There are over 28,000 miles of A-roads in the UK, and they comprise of both single and dual-carriageway roads in rural and urban areas.

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Answer: A motorway just relates to the A road that it's relieving pressure from. The reason there is no M7 is that the A7, which runs from Carlisle to Edinburgh has no need for a motorway to relieve it.

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