The effect of the Order is to temporarily prohibit vehicles on lengths of the A487 trunk road at Caernarfon Flyover to undertake works on or near the road.
Effaith y Gorchymyn yw gwahardd cerbydau dros dro ar ddarnau o gefnffordd yr A487 wrth drosffordd Caernarfon er mwyn gwneud gwaith ar y ffordd neu gerllaw iddi.