The A10 is a major road in England which runs between The City of London and King's Lynn in Norfolk. At its southern terminus, the route meets the A3 directly north of London Bridge, above Monument London Underground station. At its northern end, the A10 meets the A47 and A149 roads south-west of King's Lynn town centre. The route passes through or around primary destinations in Greater London, Hertfordshire, Cambridgeshire and Norfolk, including Dalston, Enfield, Hertford, Cambridge, Ely and Downham Market. The route between Bishopsgate in the City of London and Royston, Hertfordshire, roughly follows the path of Ermine Street, a Roman road. From Wikipedia