The effect of the Order is to temporarily undertake works on or near the M4 motorway from Junction 23, Rogiet to the Wales/England border, Monmouthshire.
Effaith y Gorchymyn yw gwneud gwaith dros dro ar draffordd yr M4 o Gyffordd 23, Rogiet i ffin Cymru/Lloegr, Sir Fynwy.