http://www.legislation.gov.uk/uksi/1989/1661/signature/madeThe Cardiff-Glan Conwy Trunk Road (A470) The Newtown-Aberystwyth Trunk Road (A44) (Trunk Roads and Junction Improvements, Llangurig) Order 1989Roads and highwaysRoad buildingCouncil policies and plansKing's Printer of Acts of Parliament2012-08-10HIGHWAYS, ENGLAND AND WALESSigned by authority of the Secretary of State for WalesH. R. BollingtonAn Assistant Secretary Welsh Office1st September 1989