Ford Grand Marquis Owner's Manual page 124

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.
Always drive and ride with your seatback
upright and the lap belt snug and low
across the hips.
Ford recommends that all safety belt
assemblies and attaching hardware should
be inspected by a qualified technician
after any collision. Safety belt assemblies
not in use during a collision should also
be inspected and replaced if either
damage or improper operation is noted.
Children should always ride with the
seatback in the fully upright position.
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