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VIDEO: Most car headlights need improvement, show IIHS ratings

A new rating of the headlights of more than 30 midsized car models gave only one model "good" rating: the top trim level Toyota Prius V, says The Insurance Institute for Highway Safety. Cars were rated on a driver's ability to see down a dark road. About half of traffic deaths in 2015 happened at night or during dawn and dusk.