Gwnaeth y Senedd basio'r ddeddfwriaeth (Gorchymyn Ffyrdd Cyfyngedig (Terfyn Cyflymder 20 mya) (Cymru) 2022) i ddod â'r terfyn cyflymder diofyn newydd ledled Cymru o fwyafrif o bron i ddwy ran o dair. O fis Medi 2023, bydd tua 35% o'r ffyrdd yng Nghymru (yn ôl hyd) yn dod yn 20mya. Gellir dadlau mai hwn fydd y newid mwyaf i ffyrdd Cymru ers i wisgo gwregys diogelwch gael ei wneud yn orfodol yn 1983. Mae'n newid, ond dros amser bydd fel gwisgo gwregys diogelwch mewn car, bydd addasu eich gyrru i'r terfyn cyflymder newydd yn dod yr un mor naturiol ag y mae gyrru ar gyflymder o 30mya nawr!
The Senedd passed the legislation (The Restricted Roads (20 mph Speed Limit) (Wales) Order 2022) to bring in the new default speed limit across Wales by an almost two-thirds majority. From September 2023 approximately 35% of the roads in Wales (by length) will become 20mph. This will arguably be the biggest change to Welsh roads since the wearing of seatbelts was made compulsory in 1983. It is a change, but over time like wearing a seat belt in a car, adapting your driving to the new speed limit will become as natural as driving at 30mph is now!