Ford Probe Owner's Manual page 91

Do not use the speed control in heavy
traffic or on roads that are winding,
slippery, or unpaved.
Accelerating With the Speed Control
Operating
If you want to speed up momentarily or regain
preset speed on hills when the speed control is
operating, simply accelerate using the accelerator
pedal. Manually accelerating to a higher speed
does not interfere with the speed control; when
you take your foot off the accelerator, the
vehicle returns to the set speed.
You can also speed up by pressing the SET ACC
button. Release the button when the vehicle has
accelerated to the desired speed.
NOTE: If your vehicle has a 5-speed manual
transaxle, you may want to drive in 4
(Fourth) gear in mountainous areas or
at high altitudes to improve speed
control performance.
NOTE: When driving uphill, especially with a
heavy load, significant speed drops
may occur. If the speed drops more
than 8 to 14 mph (15-25 km/h) the
automatic speed control will, by
design, be cancelled. You may need to
control your speed manually while
driving up steep grades in order to
maintain the selected speed.
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