Toyota Prius 2011 Manual page 220

2-4. Using other driving systems
CAUTION
To avoid operating the cruise control by mistake
■
Switch the cruise control off using the "ON-OFF" button when not in use.
Situations unsuitable for cruise control
■
Do not use cruise control in any of the following situations.
Doing so may result in loss of control and could cause an accident resulting
in death or serious injury.
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In heavy traffic
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On roads with sharp bends
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On slippery roads, such as those covered with rain, ice or snow
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On steep hills
Vehicle speed may exceed the set speed when driving down a steep hill.
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On winding roads
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