Mae’r data cyflymder cenedlaethol rhagarweiniol, a gyhoeddwyd heddiw (20 Chwefror 2024) yn galonogol. Mae’n dangos bod cyflymderau cymedrig pwysol ar sampl o brif ffyrdd cyfyngedig yng Nghymru wedi gostwng 4mya ar gyfartaledd dros y tri mis ers cyflwyno’r terfyn cyflymder diofyn.
Preliminary national speed data published today (20 February 2024) is encouraging. It shows weighted mean speeds on a sample of main restricted roads in Wales reduced by an average of 4mph over the three months after the default speed limit was introduced.