GMC C series 2002 Owner's Manual page 17

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?
1-10
With 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.