{"id":108774,"date":"2026-03-02T16:43:08","date_gmt":"2026-03-02T22:43:08","guid":{"rendered":"https:\/\/hildasibrian.com\/en\/?p=108774"},"modified":"2026-03-17T16:37:10","modified_gmt":"2026-03-17T21:37:10","slug":"underride-and-override-truck-crashes","status":"publish","type":"post","link":"https:\/\/hildasibrian.com\/en\/blog\/underride-and-override-truck-crashes\/","title":{"rendered":"“Underride” and \u201cOverride\u201d Truck Crashes"},"content":{"rendered":"\t\t
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\"\"Two of the most catastrophic types are underride and override collisions. Both involve a mismatch in height and mass between a passenger vehicle and a commercial truck or trailer, and both can bypass the passenger vehicle\u2019s crash-protection systems in ways that lead to severe head, neck, and traumatic brain injuries<\/a> – or death<\/a>.<\/p>

Underride crash<\/h3>

An underride<\/strong> crash happens when a smaller vehicle slides under<\/strong> the rear or side of a truck or trailer, allowing the truck structure to intrude into the passenger compartment. The intrusion often occurs above the car\u2019s bumpers and crumple zones, which is one reason these crashes are disproportionately fatal.<\/p>

Override crash<\/h3>

An override<\/strong> crash involves the opposite geometry: a large truck rides over<\/strong> a smaller vehicle, often in a rear-end impact where the truck climbs onto the passenger vehicle. In practice, \u201coverride\u201d is often used to describe truck-on-car rear-end crashes where the smaller vehicle gets crushed under the front of the truck.<\/p>

Why underride crashes are uniquely dangerous<\/h2>

In standard car-to-car collisions, occupant protection relies on the vehicle\u2019s front-end structure and restraint systems. Car panels are designed to buckle and fold under pressure to reduce the overall force of impact. However, in underride scenarios, the passenger compartment can be compromised early<\/strong> because the striking car can slide under the truck chassis, bypassing\u00a0 these \u201cself-protection countermeasures.\u201d These cases often result in direct injuries to the driver and passenger, usually targeting the head, chest or neck. Underride crashes account for around 400-600 deaths per year, per the Insurance Institute for Highway Safety (IIHS).<\/p>

This is why underride prevention has become a major focus of safety organizations and regulators, including the IIHS, which runs rear underride crash tests and recognizes stronger guard designs through its TOUGHGUARD program<\/a>. Guards are the panels that hang from the semi-truck’s load. Underride crashes typically fall into one of three cases:<\/p>