A1

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The A1 is the longest numbered road in the UK at 409 miles (658 km) long. It connects London, the capital city of the United Kingdom and of England, with Edinburgh, the capital of Scotland. For much of its path it follows the historic Great North Road. The modern course of the A1 diverges somewhat, particularly where it passed through a town or village that has subsequently been bypassed, or where new motorway standard road has been constructed on a more direct route. Between its junctions with the M25 (near London) and A696 (near Newcastle upon Tyne) the road forms part of the unsigned Euroroute E15 which runs from Inverness to Algeciras.

en.wikipedia.org/wiki/Great_North_Road_(United_Kingdom)