This Scheme authorises the construction of a new length of M4 motorway to the south of Newport which commences from the existing M4 motorway at Magor through to the existing M4 motorway at Castleton.
Mae’r Cynllun hwn yn awdurdodi adeiladu darn newydd o draffordd yr M4 i’r de o Gasnewydd sy’n cychwyn o draffordd bresennol yr M4 ym Magwyr drwodd i draffordd bresennol yr M4 yng Nghas-bach.