It is likely that from Q2 2023 onwards, more collisions in Dyfed Powys will be reported as serious than previously, and fewer as slight.
Mae'n debygol o Ch2 2023 ymlaen y bydd mwy o wrthdrawiadau yn Nyfed Powys yn cael eu hadrodd fel rhai difrifol nag o'r blaen, a llai fel rhai mân.