Side underride guards for semitrailers

New IIHS tests show how a well-­built side underride guard can prevent a passenger vehicle from sliding beneath the side of a semitrailer.

The tests mark the first time that IIHS has evaluated a side underride guard. IIHS ran two 35-­mph crash tests: one with a fiberglass side skirt intended to improve aerodynamics, not to prevent underride, and another with an AngelWing side underride protection device from Airflow Deflector Inc. The results were dramatically different.

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