The effect of the Order is to temporarily prohibit and restrict vehicles on lengths of the A40 trunk road at Gibraltar Tunnels, Monmouth to undertake works on or near the road.
Effaith y Gorchymyn yw gwahardd a chyfyngu ar gerbydau dros dro ar ddarnau o gefnffordd yr A40 wrth Dwneli Gibraltar, Trefynwy er mwyn gwneud gwaith ar y ffordd, neu gerllaw iddi.