Cadillac 2003 DeVille Owner's Manual page 137

Cruise Control
The buttons to operate cruise control are located on the
steering wheel.
With cruise control, you can maintain a speed of
approximately 25 mph
(40
km/h) or more without
keeping your foot on the accelerator. This is helpful on
long trips. Cruise control does not work at speeds
below about 25 mph (40 km/h). When cruise control is
on, you will see a CRUISE light on the instrument panel
cluster.
Cruise control can be dangerous where
you can't drive safely at a steady speed.
So, don't use your cruise control on
winding roads or in heavy traffic.
Cruise control can be dangerous on
slippery roads. On such roads, fast
changes in tire traction can cause
needless wheel spinning, and you could
lose control. Don't use cruise control on
slippery roads.
If your vehicle is in cruise control when the traction
control system begins to limit wheel spin, the cruise
control will automatically disengage. See Traction
Control System (TCS) on page 4-9. When road
conditions allow you to safely use it again, you may turn
the cruise control back on.
When you apply your brakes, the cruise control
shuts off.
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