During 2022, over half of all road collisions (51%) occurred on 30mph roads with the next highest proportion (25%) occurring on 60mph roads.
Yn ystod 2022, digwyddodd dros hanner yr holl wrthdrawiadau ar y ffyrdd (51%) ar ffyrdd 30mya a digwyddodd y gyfran ail uchaf (25%) ar ffyrdd 60mya.