(http://media.il.edmunds-media.com/non-make/ns/ns_30111_196.jpg) Under-ride guards on tractor-trailers often fail in crashes, with deadly results, so the Insurance Institute for Highway Safety is petitioning the federal government for a tougher standard.
Source: Big Rigs and Big Vehicles Targeted in New Safety Pushes (http://www.insideline.com:80/car-news/big-rigs-and-big-vehicles-targeted-in-new-safety-pushes.html)