Video clip of an underride guard test held at the Insurance Institute for Highway Safety research center in Ruckersville, Virginia May 5, 2016.
As the mid-size automobile hits the Stoughton underride guard at 35 mph, the airbags deploy. The guard bends but holds firm, preventing the rear of the trailer from penetrating the passenger compartment.
(Video courtesy of IIHS)
Read the related article here: Trailer manufacturers meet tougher underride standards