We had a situation where someone turned left in front of us and said he had a green light. All of the witnesses agreed that he did not. He still sued us. We’re still waiting on the case but because no one can say 100% that they seen the light, it’s our word against theirs. A dash cam would have resolved this immediately by providing unquestionably prof of the light. All I can say is, people lie. A video may only capture one or two angles but you may only need one.