FORD 1998 Explorer - Manual (Page 77)

All occupants of the vehicle, including the driver, should always
wear their safety belts.
It is extremely dangerous to ride in a cargo area, inside or
outside of a vehicle. In a collision, people riding in these areas
are more likely to be seriously injured or killed. Do not allow people to
ride in any area of your vehicle that is not equipped with seats and
safety belts. Be sure everyone in your vehicle is in a seat and using a
safety belt properly.
Each seating position in your vehicle has a specific safety belt
assembly which is made up of one buckle and one tongue that
are designed to be used as a pair. 1) Use the shoulder belt on the
outside shoulder only. Never wear the shoulder belt under the arm. 2)
Never swing it around your neck over the inside shoulder. 3) Never use
a single belt for more than one person.
Combination lap and shoulder belts
1. To fasten, insert the tongue into
the slot in the buckle.
Seating and safety restraints
77