Ford Grand Marquis Owner's Manual page 173

Do not use the speed control in heavy
traffic or on roads that are winding,
slippery, or unpaved.
If your vehicle gets stuck (for example, in mud
or snow), you may try to "rock" it out of the
spot. Shift, in a steady rhythm, between forward
(2 [Second] gear is the recommended forward
gear) and reverse gears. At the same time, press
lightly on the accelerator.
Do not spin the wheels at over 35 mph
(55 km/h). The tires may fail and injure a
passenger or bystander.
By moving the vehicle backward and forward,
you may gain enough momentum to move out
of the spot. Do not rock the vehicle for more
than a few minutes. This may overheat the
engine, damage the transmission, or damage the
tires. If you are still stuck after a minute or two
of rocking, call for a tow truck.
High water
Do not drive through flooded areas unless you
are sure that the water is below the bottom of
the wheel rims.
If you must drive through high water, drive
slowly. You may have limited traction or wet
brakes, so allow extra stopping distance because
your vehicle will not stop as quickly as usual.
After you drive through the standing water,
apply your brakes gently several times as your
vehicle moves slowly. This helps to dry the
brakes.
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