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Truck underride guard evaluations

Rear underride guards are steel bars that hang from the backs of large trucks to prevent a passenger vehicle from moving underneath in a rear crash. Crashes with underride typically involve severe damage to the occupant compartment of the smaller vehicle, often with deadly results.

IIHS evaluates the performance of rear underride guards on truck trailers made by the major manufacturers. In the tests, a midsize car traveling 35 mph is crashed into the back of a parked semitrailer. Each trailer is tested in three configurations:

  • Full width
    The car crashes into the center of the truck's rear.
  • 50 percent overlap
    Half of the car's width overlaps the rear of the truck.
  • 30 percent overlap
    Thirty percent of the car's width overlaps the rear of the truck.

Trailers that pass all three tests — meaning there is no underride in any of the crashes — qualify for the IIHS Toughguard award.

Inside IIHS: Understanding underride

This video takes viewers along as cars
are sent hurtling into the backs of semitrailers. These tests evaluate how well the trucks' underride guards prevent cars from sliding underneath.

Learn why IIHS started these tests and how they are done.

full underride test
Full-width test
50 percent underride test
50% overlap
30 percent underride test
30% overlap
Applies to units equipped with the RIG30 rear impact guard system.
Applies to all 90,000 series dry van, refrigerated and open top units built after June 2011.
Applies to all dry van units built after October 2016.
Applies to dry van and refrigerated units equipped with the additional auxiliary vertical bumper option.
Applies to all dry van units built after December 2015 and all refrigerated units built after September 2016.
Applies to dry van units with the RIG-16 option built after February 2016.
Applies to refrigerated units with the RIG-16 option built after December 2016.
Hyundai Translead
Applies to all standard dry van and refrigerated units built after April 2011. 
Tested model: 2013 dry van 

©1996-2016, Insurance Institute for Highway Safety, Highway Loss Data Institute | www.iihs.org