A dash cam can sometimes preserve useful evidence after a crash, including vehicle movement, traffic signals, sudden stops, lane position, weather, and whether another driver left the scene. It does not replace medical care, police reporting, or other documentation, but it may help clarify disputed events if the footage is saved quickly.

A dash cam can sometimes preserve useful evidence after a crash, including vehicle movement, traffic signals, sudden stops, lane position, weather, and whether another driver left the scene. It does not replace medical care, police reporting, or other documentation, but it may help clarify disputed events if the footage is saved quickly.