Smart seat belts

One of the cooler safety innovations I've read about recently is the smart seat belt. The device uses a motor and advanced technology that reels in the seat belt just prior to impact. This alleviates the chest pains felt avoiding folks in daily city driving as well as saving lives in serious crashes. The new device is still too expensive, between $500-$1000 per vehicle, for wide spread use. But like everything else technology gets cheaper with age.