http://www.legislation.gov.uk/wsi/2011/7/madeThe A48(M) Motorway (St Mellons, Cardiff) (Temporary 50 MPH Speed Limit) Order 2011Gorchymyn Traffordd yr A48(M) (Llaneirwg, Caerdydd) (Terfyn Cyflymder 50 MYA Dros Dro) 2011King's Printer of Acts of Parliament2011-03-01