#underride

The next time you’re driving behind a semitrailer take notice of that metal bumper hanging off the back. That’s the underride guard, and its job it to prevent your minuscule hatchback from hurdling beneath its hulking mass on the off chance that you have a collision.

Sadly, not all guards are created equal and some buckle during an accident — allowing the car’s passenger compartment to impact the rear of the trailer, frequently shearing off the part of the vehicle that your head occupies.

To further scare you out of tailgating trucks, the Insurance Institute for Highway Safety released a 2011 report stating that the majority of those guards would fail and that the National Highway Traffic Safety Administration’s minimum structural guidelines for underride bars was inadequate. While some manufacturers had begun installing stronger and safer guards, mainly to satisfy higher Canadian standards, the initial round of IIHS’ testing resulted in most underride guards failing in a 30-percent overlap test.