The data published today clearly shows that casualties on 20mph and 30mph roads have reduced since the introduction of 20mph - the lowest on record outside the Covid pandemic period.
Mae'r data a gyhoeddwyd heddiw yn dangos yn glir bod anafiadau ar ffyrdd 20mya a 30mya wedi lleihau ers cyflwyno 20mya - yr isaf erioed y tu allan i gyfnod pandemig COVID.