 The route of the A1 in London runs from the northern end of St. Martin's Le Grand in the City to Borehamwood in Hertfordshire, then travels on the northern fringe of Greater London to Bignell's Corner, where it crosses the M25 and becomes a motorway, designated A1 (M), which alternates with the dual carriageway A1 as it continues to Edinburgh. The London section of the road passes through part of the City of London and three London boroughs: Islington, Haringey and Barnet. The A1 is one of London's main northern routes, providing a link to the M1 motorway and the A1 (M) motorway, and on to the Midlands, Northern England and Scotland. It connects a number of major areas within London, and sections of it serve as the High Street for many of the now-joined villages that make up north London. Even though it is one of London's major roads, less than 5 % of its approximate 60,000 vehicles a day are through traffic – the bulk is local.
