GMC 2009 Sierra - Manual (Page 147)

Cruise Control
{ CAUTION:
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 excessive wheel slip, and
you could lose control. Do not use cruise
control on slippery roads.
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).
When you apply your brakes, cruise control is
turned off.
If your vehicle has the StabiliTrak ® system and begins
to limit wheel spin while you are using cruise control,
the cruise control will automatically disengage. See
StabiliTrak
® System on page 4-5. When road conditions
allow you to safely use it again, you may turn the
cruise control back on.
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