Commercial Truck Crashes Cause Disproportionate Fatalities and Injuries

Commercial semi‑trucks can weigh up to 80,000 lb—about twenty times the mass of a typical passenger car. The resulting kinetic‑energy disparity means that in multi‑vehicle collisions the smaller vehicle absorbs most of the force, leading to severe injuries and deaths. Data from the National Highway Traffic Safety Administration show that roughly 72 % of fatalities in truck‑involved crashes are occupants of the smaller vehicle.

Underride accidents—where a car slides beneath a trailer’s rear or side—are among the deadliest crash types because standard vehicle safety systems are not designed for such impacts. While rear underride guards are required on most trailers, side guards are not universally mandated in the United States, leaving a safety gap. Additionally, fully loaded trucks need significantly longer stopping distances—up to 520 ft at 65 mph—compared with about 300 ft for passenger cars, increasing the likelihood of rear‑end collisions during sudden slow‑downs or adverse weather.

These factors combine to make truck‑related crashes disproportionately lethal for occupants of smaller vehicles, highlighting the need for enhanced guard requirements and driver awareness of the unique dynamics of large‑vehicle collisions.