The effect of the order is to temporarily prohibit vehicles on lengths of the M4 motorway between Junctions 23a and 34 and A48(M) motorway to undertake works on or near the roads.
Effaith y gorchymyn yw gwahardd cerbydau dros dro ar ddarnau o draffordd yr M4 rhwng cyffyrdd 23A a 34 a thraffordd yr A48(M) er mwyn gwneud gwaith ar y ffyrdd neu gerllaw iddynt.