Citation of United Kingdom legislation includes the systems used for legislation passed by devolved parliaments and assemblies, for secondary legislation, and for prerogative instruments. It is relatively complex both due to the different sources of legislation in the United Kingdom, and because of the different histories of the constituent countries of the United Kingdom.
The A479, officially also known as the Glanusk Park (Crickhowell)—Llyswen Trunk Road, is a trunk road in Wales. It connects Crickhowell to Llyswen via the Rhiangoll valley and Talgarth, running through the Brecon Beacons National Park.
Trunk roads in Wales were created in the Trunk Roads Act of 1936 when the UK Ministry of Transport took direct control over 30 of the principal roads in Great Britain from English, Welsh and Scottish local authorities. The number of trunk roads was increased from 30 to 101 in the Trunk Roads Act of 1946. These roads formed what the Act called "the national system of routes for through traffic". Since Welsh devolution the trunk road system in Wales has been managed by the South Wales Trunk Road Agent and the North and Mid Wales Trunk Road Agent on behalf of the Welsh Government. As of April 2019, out of a total of 34,850 miles (56,090 km) of roads in Wales, 1,576 miles (2,536 km) are trunk roads.
