2004 GMC Sierra 1500 Pickup Owner's Manual - Page 18

A few crashes are mild, and some crashes can be so serious that even buckled up, a person wouldn't survive. But most crashes are in between. In many of them, people who buckle up can survive and sometimes walk away. Without belts they could have been badly hurt or killed. After more than 30 years of safety belts in vehicles, the facts are clear. In most crashes buckling up does matter...a lot! Why Safety Belts Work When you ride in or on anything, you go as fast as it goes. Take the simplest vehicle. Suppose it's just a seat on wheels. 1-12