Dywedodd bron i ddwy ran o dair o'r bobl a holwyd y byddent yn cefnogi terfyn cyflymder o 20mya yn eu hardal a dywedodd 62% eu bod am i bawb arafu ar y ffyrdd.
Almost two-thirds of people surveyed said they would support a 20mph speed limit where they lived and 62% said they wanted everyone to slow down on the roads.