GMC 1999 Sierra 1500 Pickup Owner's Manual page 116

Features & Contmls
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Cruise Control can be dangerous where you can't safely drive 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.
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To Set Cruise Control
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Move the Cruise switch to ON.
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CAUTION
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If
you leave your Cruise Control switch on when you're not using
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Cruise, you might hit a button and go into Cruise when you don't
want to. You could be startled and even lose control. Keep the
Cruise Control switch OFF until vou want to use it.
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Get up to the speed you want.
Push in the set button at the end of the lever and release it,
Take your foot off the accelerator pedal.
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