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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. Earlier research showed that the minimum strength and dimensions required for underride guards are inadequate, prompting the Institute to petition the National Highway Traffic Safety Administration (NHTSA) in 2011 for tougher standards. The Institute also asked the agency to consider applying the standards to other types of large trucks, such as dump trucks that aren’t required to have any underride guards.