The effect of the Order is to temporarily prohibit vehicles on lengths of the M4 motorway at Junction 45 (Ynysforgan), Swansea to undertake works on or near the road.
Effaith y Gorchymyn yw gwahardd cerbydau dros dro ar ddarnau o draffordd yr M4 wrth Gyffordd 45 (Ynysforgan), Abertawe er mwyn gwneud gwaith ar y ffordd, neu gerllaw iddi.