Highways authorities are currently preparing for the necessary changes in advance of the 20mph default speed limit on restricted roads coming into force in September 2023.
Mae awdurdodau priffyrdd wrthi’n paratoi ar gyfer y newidiadau angenrheidiol hyn cyn i’r terfyn cyflymder diofyn o 20mya ar ffyrdd cyfyngedig ddod i rym ym mis Medi 2023.