Motorways have the “M” designation before or after the road number, such as M1 or A1(M). The addition of the '(M)' means the former dual carriageway (the A1) has been upgraded to motorway status.
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At 410 miles the A1 is Britain's longest road, connecting London to Edinburgh. The A14 meets the A1 at Brampton in Cambridgeshire and, as part of the A14 project, Highways England has widened it from two lanes to three in both directions between Alconbury and Buckden and built a redesigned junction at Brampton Hut.
Answer. 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.
The national speed limit is 70 mph (112 km/h) on motorways, 70 mph (112 km/h) on dual carriageways, 60 mph (96 km/h) on single carriageways and generally 30 mph (48 km/h) (20 mph (32 km/h) in Wales) in areas with street lighting (Built-up area).