They have many advantages such as identifying who is responsible for causing an accident, providing evidence, resolving disputes, and in some instances it may lower insurance premiums.
Mae iddynt lawer o fanteision megis nodi pwy sy'n gyfrifol am achosi damwain, darparu tystiolaeth, datrys anghydfodau ac, mewn rhai achosion, gallant leihau premiymau yswiriant.