How to Wear Safety Belts Properly- Page 25

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4. Push the latch plate into the buckle until it clicks.

Pull up on the latch plate to make sure it is secure. 
If the belt isn’t long enough, see “Safety Belt
Extender” at the end of this section.

Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.

5. To make the lap part tight, pull down on the buckle

end of the belt as you pull up on the shoulder belt.

The lap part of the belt should be worn low and snug on
the hips, just touching the thighs. In a crash, this applies
force to the strong pelvic bones. And you’d be less
likely to slide under the lap belt. If you slid under it, 
the belt would apply force at your abdomen. This could
cause serious or even fatal injuries. The shoulder belt
should go over the shoulder and across the chest. 
These parts of the body are best able to take belt
restraining forces.

The safety belt locks if there’s a sudden stop or crash, 
or if you pull the belt very quickly out of the retractor.