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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There is no M7 because there has never been a need to replace the A7 with a motorway. There was an idea in the 1990s to build a new toll road linking Edinburgh and the A74 (M), along the lines of the A702, and the idea was floated that this could take the M7 number.