The effect of the Order is to temporarily prohibit vehicles on a length of the A483 trunk road at Ffairfach level crossing to undertake works on or near the road.
Effaith y Gorchymyn yw gwahardd cerbydau dros dro ar ddarn o gefnffordd yr A483 wrth groesfan reilffordd Ffair-fach er mwyn gwneud gwaith ar y ffordd neu gerllaw iddi.