	From the Port of Felixstowe the road heads west, bypassing Ipswich to the south via the Orwell Bridge and to Stowmarket, Bury St Edmunds, Newmarket and Cambridge where it meets the M11, then past St Ives, Huntingdon and the junction with the A1, from there through Kettering, Northamptonshire, ending at junction 19 of the M1 and the start of the M6.