DEADLY CRASHES – WORST Crash Test Car IIHS: This crash tests iihs is one of the worst crash test. New crash tests: Underride guards on most big rigs leave passenger vehicle occupants at risk in certain crashes
DEADLY Crashes – IIHS Crash Tests Accident Car
DEADLY Сбои: IIHS краш-тестов
ÖLÜMCÜL Çöküyor: IIHS Crash Testleri
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.
Most semitrailers are required to have underride guards. These are steel bars that hang from the backs of trailers to prevent the front of a passenger vehicle from moving underneath during a crash. 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.
Although NHTSA hasn’t responded yet, trailer manufacturers already are installing guards that are much stronger than the agency requires. These guards generally work well to prevent underride, except in crashes occurring at the outer edges of trailers, the crash tests show.
One likely reason manufacturers are installing guards that are stronger than required is a tougher standard that trailers in Canada have had to meet since 2007. More recently, IIHS crash tests have drawn attention to the issue, and at least one manufacturer has started selling a trailer with an improved underride guard since the tests began.
To see how well the latest guards work, IIHS engineers put trailers from the eight largest manufacturers through a series of progressively tougher crash tests. All of the trailers had underride guards that met both U.S. and Canadian standards. Both standards require a guard to withstand a certain amount of force at various points. Under the Canadian regulation, a guard must withstand about twice as much force as required by the U.S. rule at the point where it attaches to its vertical support.
In each crash test, a 2010 Chevrolet Malibu (but also rolls royce crash test) struck a parked truck at 35 mph. In the first scenario, the car was aimed at the center of the trailer. All eight guards successfully prevented underride, including one from Hyundai Translead, whose previous model failed a full-width test by IIHS. In the second test, in which only half the width of the car overlapped with the trailer, all but one trailer passed. However, when the overlap was reduced to 30 percent, every trailer except one from the Canadian manufacturer Manac failed. Manac sells dry van trailers in the U.S. under the name Trailmobile. The Institute uses a 30 percent overlap for the most challenging underride test because it is the minimum overlap under which a passenger vehicle occupant’s head is likely to strike a trailer if an underride guard fails.
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