The effect of the Order is to temporarily prohibit vehicles on lengths of the M4 motorway between junctions 34 and 49 to undertake works on or near the road.
Effaith y Gorchymyn yw gwahardd cerbydau dros dro ar ddarnau o draffordd yr M4 rhwng cyffyrdd 34 a 49 er mwyn gwneud gwaith ar y ffordd neu gerllaw iddi.