http://www.legislation.gov.uk/uksi/1995/2448/article/2/madeThe Glanusk Park (Crickhowell)-Llyswen Trunk Road (A479) (Dderw Improvement) Order 1995Roads and highwaysRoad buildingKing's Printer of Acts of Parliament2011-07-04HIGHWAYS, ENGLAND AND WALES2The central line of the new trunk road is indicated by a heavy black line on the deposited plan.