I put one in each of our cars. My wife drove into the back of another car at a roundabout. She accepted it was her fault, but her genuine memory of events was that the car ahead had set off, then stopped again.
In fact, when we reviewed the video, the car had simply stopped and waited. My wife had seen that the roundabout was clear, and had assumed he would go - she had just run into him while looking in a different direction! It turned out that he was from Newcastle, 200 miles away, so he was probably just wondering which way to go...not advised at roundabouts!
Of course this was was of no help with the claim but the interesting point is that what witnesses think happened, and what actually happened, can be very different; let alone when they start lying deliberately.
Neither of us bothers to save video of idiots to post on youtube or send to the police. I suppose we might if we caught a crash-for-cash or similar, but for the most part I think that would be a waste of time.
The main point for us is that there is a good chance we will have some useful evidence if somebody else causes an accident and then lies about it - which seems to happen more often than not.
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