Gwneir yr holl derfynau cyflymder 20 mya newydd trwy Orchmynion Traffig newydd ac ymgynghorir â'r rhai yr effeithir arnynt gan ddefnyddio'r prosesau statudol. Yn amodol ar ganlyniad cadarnhaol o'r ymgynghoriad, bydd y peilotiaid yn cael cychwyn fesul cam, o haf 2021, tan ddiwedd y flwyddyn.
All the new 20 mph speed limits will be made by way of new Traffic Orders and those affected will be consulted using the statutory processes. Subject to a positive outcome from the consultation, the pilots will have a phased start, from summer 2021, until the end of the year.