The effect of the Order is to temporarily prohibit vehicles on lengths of the M4 and A48(M) motorways to undertake works on or near the roads.
Effaith y Gorchymyn yw gwahardd cerbydau dros dro ar ddarnau o draffyrdd yt M4 a’r A48(M) er mwyn gwneud gwaith ar y ffyrdd, neu gerllaw iddynt.