2006 GMC Envoy Owner's Manual - Page 21

In most states and in all Canadian provinces, the law says to wear safety belts. Here is why: They work. You never know if you will be in a crash. If you do have a crash, you do not know if it will be a bad one. A few crashes are mild, and some crashes can be so serious that even buckled up, a person would not 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 is just a seat on wheels. 1-15