Cadillac XLR-V 2006 Owner's Manual page 12

In most states and all Canadian provinces, the law says
to wear safety belts. Here's why: They work.
You never know if you'll be in a crash. If you do have
a crash, you don't 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 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!
1-6
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.