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Rare, but there have been a few times over the years when it might have. The few accidents I have had would not have been prevented by a horn. Still, the other day, I was changing lanes on the freeway, moving into the left lane. I looked to my left, no one there, went to change lanes, and another car almost barreled into me. He honked, and I went back into my lane, possibly preventing the accident. I think he changed lanes at about the same time I did and floored it. Not responsible driving, but the horn might have prevented an accident at highway speeds.