Duty Officers are required to review the weather forecasts received and determine the appropriate action to be taken with reference to the prevailing weather and road conditions.
Mae'n ofynnol i Swyddogion ar Ddyletswydd adolygu'r rhagolygon tywydd a phenderfynu ar y camau priodol i'w cymryd gan gyfeirio at y tywydd a'r amodau ffyrdd cyffredinol.