The clearway will ensure free flowing traffic on the A465 trunk road between Brynmawr, Blaenau Gwent and Glanbaiden, Monmouthshire to maximise capacity of the route and to improve road safety.
Bydd y Gorchymyn arfaethedig yn cyflwyno terfyn cyflymder 50mph ar hyd rhannau o'r A465 rhwng Brynmawr, Blaenau Gwent a Lanbaiden, Sir Fynwy.