Wales is not alone in moving towards 20mph in place of 30mph limits within settlements where people outside of vehicles are vulnerable as a consequence of vehicle speed.
Nid Cymru yw’r unig wlad sy’n ystyried terfynau o 20mya yn lle 30mya o fewn aneddiadau lle mae pobl y tu allan i gerbydau mewn perygl o ganlyniad i gyflymder cerbydau.