You have probably driven behind a tractor-trailer hundreds of times without thinking about the steel bar hanging off the back. It has a formal name — a rear impact guard, sometimes called an underride guard — and its only job is to stop a car from sliding underneath the trailer in a rear-end crash. When it works, it can save your life. When it fails, the consequences are among the most horrifying things that can happen on a highway.
That is why a recent federal action matters. In a round of commercial-vehicle safety recalls issued in early May, regulators flagged a batch of trailers built over several model years because their rear impact guards were missing welds, which reduced the guards’ structural strength. According to the recall, a guard with inadequate strength may not protect the vehicle behind it and increases the risk of injury in a rear-end crash.
It helps to picture what an underride crash actually looks like, because most drivers never have. Your car’s safety systems — its crumple zones, airbags, and reinforced cabin — are designed to absorb a frontal impact at bumper height. But when you rear-end a high-riding trailer and the guard gives way, your car keeps moving forward and slides beneath the trailer. The trailer’s edge passes over your hood and into the passenger compartment. The very safety features that should protect you in a normal collision never get the chance to do their job.
Maryland Trucking Accident Lawyer Blog


