The trial will commence on the 6 March and is planned to be completed within four days, though this could take longer if there is severe weather or another unforeseeable setback.
Bydd y treialu yn dechrau ar y 6 Mawrth a'r bwriad yw ei gwblhau o fewn pedwar diwrnod, er y gallai hyn gymryd mwy o amser os oes tywydd garw neu broblem annisgwyl arall.