2003 GMC Sierra 1500 Pickup Owner's Manual - Page 165

Cruise Control This can really help on long trips. Cruise control does not work at speeds below about 25 mph (40 km/h). If you apply your brakes, or press the clutch pedal (if equipped), the cruise control will disengage. 0: off I : On t : Resume/Accelerate With cruise control, you can maintain a speed of about 25 mph (40 km/h) or more without keeping your foot on the accelerator. Cruise control can be dangerouswhere 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. 3-10