Understanding Underride Collisions in Utah: A Legal Guide Underride collisions are a particularly devastating type of truck accident. They occur when a passenger vehicle slides under the body of a large truck during a collision. The consequences are often catastrophic due to the passenger vehicle's safety features being rendered ineffective by the impact with the truck's frame rather than its bumpers. What is an Underride Collision? An underride collision happens when a smaller vehicle, like a car, goes underneath a larger vehicle, typically a commercial truck or semi-trailer, during an accident. This often occurs because the truck's underride guards (also known as Mansfield bars) fail to prevent the smaller vehicle from sliding beneath the truck's body. Without proper underride protection, the car's roof and windshield can bear the brunt of the impact, leading to severe injuries or fatalities for the occupants. Why Underride Accidents Are S...