http://www.legislation.gov.uk/uksi/1988/1387/signature/madeThe A406 London North Circular Trunk Road (East London River Crossing (A13 to A2) Trunk Road and Slip Roads) Order 1988Roads and highwaysRoad buildingKing's Printer of Acts of Parliament2011-07-04HIGHWAYS, ENGLAND AND WALESSigned by authority of the Secretary of StateP. WoodAn Under Secretary in theDepartment of Transport1st August 1988