starting just north of the blackwall tunnel where it connects end on to the a102, it heads north through bow and hackney wick, then northeast through leyton and romford, then into essex, passing brentwood and colchester. in suffolk, it passes ipswich and saxmundham, then follows the coast through lowestoft before entering norfolk, passing through gorleston-on-sea and ending at great yarmouth, as of february 2017, the route was renumbered between great yarmouth and lowestoft to become the a47 so the road now terminates at the bascule bridge south of lowestoft town centre.