Cadillac 2005 XLR Owner's Manual page 125

+ (Resume/Accelerate): Move the lever to this symbol
to make the vehicle accelerate or resume to a
previously set speed.
T
(Set): Press this button to set the speed.
With cruise control, you can maintain a speed of about
25 mph (40 km/h) or more without keeping your foot
on the accelerator. This can really help on long
trips. Cruise control does not work at speeds below
about 25 mph (40 km/h).
Cruise control will not work if your parking brake is set,
or if the master cylinder brake fluid level is low.
If you apply your brakes, the cruise control will shut off.
CAUTION:
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Cruise control can be dangerous where you
cannot drive safely at a steady speed. So, do
not 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. Do not use cruise
control on slippery roads.
If your vehicle is in cruise control when the traction
control system (if equipped) begins to limit wheel spin,
the cruise control will automatically disengage. See
Traction Control System (TCS) on page 5-8. When road
conditions allow you to safely use it again, you may
turn cruise control back on.
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