To Turn Speed Control Off; To Set A Speed - Ford 2000 Crown Victoria Owner's Manual

Controls and features
Do not use the speed control in heavy traffic or on roads that
are winding, slippery, or unpaved.
Do not shift the gearshift lever into N (Neutral) with the speed
control on.

To turn speed control off

Press OFF or
Turn off the vehicle ignition.
Once speed control is switched off, the previously programmed set speed
will be erased.

To set a speed

Press SET/SET ACC/SET ACCEL.
For speed control to operate, the
speed control must be ON and
the vehicle speed must be greater
than 48 km/h (30 mph).
If you drive up or down a steep hill, your vehicle speed may vary
momentarily slower or faster than the set speed. This is normal.
Speed control cannot reduce the vehicle speed if it increases above the
set speed on a downhill. If your vehicle speed is faster than the set
speed while driving on a downhill, you may want to shift to the next
lower gear or apply the brakes to reduce your vehicle speed.
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ON
OFF
RESUME
SET
ACCEL
COAST