Pontiac 2003 Vibe - Manual (Page 103)

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Cruise Control (Option)
The cruise control lever is located on the right side of
the steering wheel.
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).
CAUTION:
D Cruise control can be dangerous where you
can’t drive safely at a steady speed. So,
don’t use your cruise control on winding
roads or in heavy traffic.
D 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.