http://www.legislation.gov.uk/uksi/1988/1830/article/2/madeThe London—Great Yarmouth Trunk Road (A12) (Eastway to Eastern Avenue Section) (Green Man Interchange Slip Roads) Order 1988Roads and highwaysRoad buildingStreet numbering and namingKing's Printer of Acts of Parliament2011-07-04HIGHWAYS, ENGLAND AND WALES2The centre line of each of the new trunk roads is indicated by a heavy black line on the deposited plan.