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& l% l: L( A3 I4 J3 n( [$ G$ v a1 T7 vNew crash tests: Underride guards on most big rigs leave passenger vehicle occupants at risk in certain crashes$ q5 i# d; ~& G
$ f' t: u' y/ ]5 l5 U/ JModern semitrailers for the most part do a good job of keeping passenger vehicles from sliding underneath them, greatly increasing the chances of surviving a crash into the back of a large truck, recent tests by the Insurance Institute for Highway Safety (IIHS) show. But in crashes involving only a small portion of the truck's rear, most trailers fail to prevent potentially deadly underride.