http://www.legislation.gov.uk/wsi/2017/684/madeThe M4 Motorway (Westbound between Junction 23a (Magor), Monmouthshire and Junction 33 (Cardiff West), Cardiff) and A48(M) Motorway (Westbound) (Temporary 50 mph Speed Limit) Order 2017Gorchymyn Traffordd yr M4 (Cerbytffordd tua’r Gorllewin rhwng Cyffordd 23a (Magwyr), Sir Fynwy a Chyffordd 33 (Gorllewin Caerdydd), Caerdydd) a Thraffordd yr A48(M) (Cerbytffordd tua’r Gorllewin) (Terfyn Cyflymder 50 mya Dros Dro) 2017King's Printer of Acts of Parliament2017-06-16