GMC TopKick 2007 Owner's Manual page 24

Or it could be the instrument panel.
Now, what if you and your passengers were to
give that big vehicle a chance to deal with
the force of the impact, instead of you?
24
With safety belts, you slow down as the vehicle
does. You get more time to stop.
You stop over more distance, and your strongest
bones take the forces. Safety belts are for
everyone.