" y6 p! A6 |# U6 k4 F5 G/ n% sNew crash tests: Underride guards on most big rigs leave passenger vehicle occupants at risk in certain crashes8 v6 Y; z2 R! Q$ B, y8 k$ e
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Modern 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.