Chevrolet 2008 Colorado Owner's Manual page 145

With cruise control, the vehicle 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 the parking brake is set,
or if the master cylinder brake fluid level is low.
If the brakes are applied, 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 excessive wheel slip, and
you could lose control. Do not use cruise
control on slippery roads.
If your vehicle has the Traction Control System (TCS)
and it begins to limit wheel spin while the cruise control
is on, the cruise control will automatically disengage.
See Traction Control System (TCS) on page 4-5. When
road conditions allow you to safely use it again, you
can turn cruise control back on.
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