A1 road (Great Britain)

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A1
A1   A1(M)
Route information
Part of E15
Length	410.00 mi (659.83 km)
Major junctions
South end	A1211 in City of London[1]
Major intersections	M1 M25 A14 A47 M18 M62 M1 A64 A168 A66 A66(M) A194(M) A69 A19 A720
North end	Edinburgh[2]
Location
Country	United Kingdom
Primary destinations	London Stevenage Huntingdon Peterborough Stamford Grantham Newark-on-Trent Worksop Doncaster Pontefract Wetherby Harrogate Ripon Scotch Corner Darlington Durham Gateshead Newcastle upon Tyne Berwick-upon-Tweed Edinburgh
Road network
Roads in the United Kingdom Motorways A and B road zones
→ A2

The A1, also known as the Great North Road, is the longest numbered road in the United Kingdom, at 410 miles (660 km). It connects London, the capital of England, with Edinburgh, the capital of Scotland. The numbering system for A-roads, devised in the early 1920s, was based around patterns of roads radiating from two hubs at London and Edinburgh. The first number in the system, A1, was given to the most important part of that system: the road from London to Edinburgh, joining the two central points of the system and linking the UK's (then) two mainland capital cities.^[3] It passes through or near north London, Hatfield, Welwyn Garden City, Stevenage, Baldock, Letchworth Garden City, Biggleswade, Eaton Socon, Buckden, Peterborough, Stamford, Grantham, Newark-on-Trent, Retford, Doncaster, Pontefract, York, Wetherby, Ripon, Darlington, Durham, Gateshead, Newcastle upon Tyne, Morpeth, Alnwick and Berwick-upon-Tweed.^[4][5]

It was designated by the Ministry of Transport in 1921, and for much of its route it followed various branches of the historic Great North Road, the main deviation being between Boroughbridge and Darlington. The course of the A1 has changed where towns or villages have been bypassed, and where new alignments have taken a slightly different route. Several sections of the route have been upgraded to motorway standard and designated A1(M). Between the M25 (near London) and the A720 (near Edinburgh) the road is part of the unsigned Euroroute E15 from Inverness to Algeciras.